well, yes... course everyone is different!~ I don't fair well when my Moon is squared out of someone's Leo planets, or when my Sun is stressed by a late Aries placement square or even having direct conjunctions with them on top... and my Mercury is the other way around from my Sun, it prefers an Aries side square but not the Libra side... oppositions haven't ever been a huge problem for me personally except where my DSC is concerned because of how many tricky squares are caught in the mix from my Sagittarius(-Gemini) placements. (BM Lilith Pisces DSC - but Neptune in Sagittarius. I only seem to be able to mesh with Pisces with planets in very precise placements in the sign to other favourable aspects there and elsewhere that help combat the negatives). For me it doesn't seem to come down to what planet makes the aspect so much as the type of aspect we have together and our own personal negative natal placements and whether we've managed to handle them well on our own or not before we meet up/communicate. ex: my Moon in Taurus doesn't care if they have Moon or Mars or Venus square it from Aquarius, only when it is from Leo's end... probably/possibly also because I have Sun trine Moon from the 5th... my own Leo influences and Aquarius influences feel more agitated dealing with that aspect from Leos. (My Moon is on Aquarius duad, adding a natural square energy to it already from that sign that I've had a lifetime to adapt to and negotiate and harmonize with, I also have ruler of my Moon's house cnj Uranus; but I do feel I lack in Leo energy elsewhere... Leo is lord of my 12th...)
*not to say I don't like/get along with any sign placement-ers just because we have bad aspects like these, but that they do tend to contribute to confusion/discomfort in a lighter sense and hositility in the more severe/harsher times that I've met with it from them. XD It's never so simple as just one of these aspects either... I get along well with just about anyone, and have been blessed with few enemies for whatever reason, and an "easy" chart to boot! But, when I do have an instant reaction toward someone (even though I will try to make peace with it, feel compelled to make peace any way I can and need to understand them), if it does come down to a one sided effort and they too feel those bad aspects/act on them - it usually shows that we have more than a few things putting us at odds. ; ;
It doesn't even always come down to an actual aspect at all for me, I've encountered people who I couldn't relate with or that couldn't accept me before because of things like them being weak in a planet/element that I am strong in, and surely vs/vs can be incompatible as well at times.
For the longest time I couldn't understand or relate with Gemini, especially my one grandmother with her big 3 in Gemini. I simply lack air in my chart (enough air at least) to relate to her and we came to misunderstand one another almost constantly, on top of that Mercury-Mercury opposition needed balancing. But, by the grace of progression and patience and embracing Mercury in my own chart, Gemini people (some of my closest friends now) are delightfully fascinating instead of frustrating anymore~! lol It can be this way for others trying to comprehend my energies too, I'm heavy with Mercury and Jupiter - I can talk/write like the wind and can't really tolerate narrow-mindedness, can't sit still for long, and have a very short attention span (or so it seems, I'm usually multitasking and to others it would look like I was busy moving onto something new when I'm just trying to get done as much as I can at the same time *ello efficiency* ~ I'm mutable but cardinal Sun, Saturn ruled... I have a lot of lunar energy too... good deal of intuition and even moderate sensitivity for the blight of those around me, some people do not "get" that, they see me as either being "sneaky" or "cold" (could be they misunderstand)... either they expect me to conform, settle, or slow... and I cannot. Some have remarked that I am either A) too serious or B) too optimistic/lighthearted (geeze, the fickleness) - some beat their breasts at me because I am quick to call out what they'd rather I didn't/don't want to hear when it is what it is... right?~ well, I don't really have the patience to deal with them either... I'm not a confrontational type, but I'm pretty stubborn and do not bow out of something just because someone is roaring louder... lol
Those types... they don't always have aspects right? But, they will have things like a super strong ego (sun), or heavy Mars/Neptune, sometimes they are super-Earthy! (I know, I'm big 3 Earth, but I ony have one of their rulers in Earth... lol complicated? yesh/no...)
I don't like to fight with people or pretend things are okay when they're not... to me it is both a waste of time. So, I've not really stuck around those types to get all of our astro-synastry completed very often. So these possible signs for repulsion/unattractive qualities are ones I've encountered enough times in relationships that were maybe brief, and undetermined/understated in nature in the beginning... like colleagues, friends of friends, or friends of family. ^^; (who sticks around long enough with people they aren't attracted to or find repulsive or cannot bear to be around anyway, no?!) lol
But, for others it may be certain planets for sure, on top of those harsh aspects. It could be that my not so complicated chart leads me to have less problems with individual planets, since mine aren't receiving any major negative aspects in my natal... but, for someone who already has a challenging Pluto aspect(s) in their own chart having to deal with someone else's in synastry can be repellent too, I believe.
My only -major- negative aspect is 8* wide opposition between Saturn and Moon. ^^; hehehe~ I haven't been unattracted to those opposite or square to my Saturn (@__@ maybe it's the other way then, idk?! lol) But, Moon yes... but, I'm pretty cool with those opposite it. odd~ maybe? not sure~ =X
(sorry so long. ugh...) >.<;;;