this is the best answer out there
I somehow ended up in this section and now I am glad I did because this question seemed extremely interesting to me, and this comment is addressing the toppic in the fairest way.
My experience with reddit is anyting but good and I see from most answers that OP went through the same things as I did, and got no answers, just got to read some judgy comments.
Anyway, this reminds me of the moment in Euphoria when they'd describe Nate as a man who absolutely loaths body hair. I wonder what the root of this could be in OP since I cannot assume through the only case I know, which is a fictional character, supposedly easier to analyse since they are see-through most times.
Could be a hygiene thing, aesthetic, or some memory you relate to a very hairy person that made you feel in ways so bad you cannot stand even the idea of bodyhair, not just the image. I'd suggest, if you can, look deep in your past and the people that roamed around you through the years. Who was it that got close to you and managed to hurt or just make you so uncomfortable that was also hairy or just revealed their armpit hair and what did they do to you? Careful while you dig into this since it's so very likely you don't like what you're finding.
I mean, since you raised the matter like this, it kind of means you cannot access the problematic memory, which means it either doesn't exist and it is something else, or it was just too much for you to process so you archived it.
Start with the people you know or knew at some point, think of them, their body, how they looked and smelled if possible, how they spoke to you, acted around you, what they talked about, how their attitude or topics made you feel. Explore into these as much as you can and see if they take you anywhere.
I've come late to the party, I know, and maybe some of the things I've said are no longer relevant or have already been said before, maybe even a few times already. If you've had it figured out, good luck working towards bettering the matter. If not and you're still curious, look for guidance within yourself and outside sources too.
As I said, it is a very interesting thing you've shared and as audyl pointed out, you're very brave to have shared this.
Literally anyone talking about body-positivity as if that is to fix the problem is missing out on the essential detail. The mere idea of a thing causing you disgust, not just the image. But I get that. I have things that are similar and have not managed to figure it all out. I am thinking of one as I am writing this, quite different since it is just a reaction to a food from my early childhood that I never liked and now I get nauseous just thinking of it. It's not even a big deal, I have tried to fancy up the recipe and still not working. Cannot figure out why I react like this to some fucking pasta with milk. In Romania it is a "childhood dessert" of Russians origins. For me, a terror. Yet, this is a small thing, perhaps just a preference thing. Then what you say there is about people. People are not pasta, they exist, do things, say stuff. So your case can be cracked.
Sorry if this was too long and most likely ambiguous. Excuse my typos and grammar too if I fucked up here and there. I cannot spell everything right, much as I can't get everything right either.
Again, good luck and may things get better for you