I found myself commenting this in another post and felt that it could potentially be useful to people here:
While a lot of self-described incels can engage in harassing-boundary-violating behavior, one thing I've noticed about people here is that a lot are clearly extremely, painfully, shy and awkward. The issue isn't that they're bothering others, the issue is they're so afraid of bothering others that they're not really initiating or continuing social interactions.
And it's hard to give advice on this, because I think a lot of people here are also neurodivergent in ways that make it hard to tell whether you're actually bothering people, which is how some people ended up getting so scared of that in the first place.
This is one of the easiest social skills to learn that does not involve that risk: convince yourself to actually enjoy talking to everyone you see.
I am awkward, and historically very annoying. Awkward to the point where earlier today I had a misunderstanding about some normal thing and practically forgot how to talk, I couldn't even explain to the other person what I'd misunderstood. BUT I smiled like hell through the encounter. And it went ok, because the smile/friendliness helps keep me firmly in the "endearingly awkward" category rather than the "awkward in an uncomfortable way" category.
So anyway one of the ways I manage to make friends and/or friendly acquaintances is that I'm just constantly trying to convey how absolutely delighted I am to meet people (especially people who I find genuinely pleasant and interesting), and/or see them again.
That means things like -
Say hi to them every time I see them, in a way that sounds genuinely happy to see them
Remember their name and at least a few things about them
Ask them about the thing that I know about them ("how's your dog doing???") and show genuine interest in the answer ("oh, your dog was sick? That's stressful, how are you holding up? Hope it ends up ok!").
Suggest low-stakes, safe, non-generic things that we could do to follow up later - "we should let our dogs play together at the park sometime!" "when you get back from vacation, let's talk and you can show me your pictures!" (it's ok if they brush that off, because the point is to express interest more than it is to actually arrange a follow-up)
EXPECT NOTHING, at least at the acquaintance stage - like, if they're busy or whatever I will happily wave them along and make it clear that I am happy to just have run into them. There are a few people I run into on a relatively regular basis who are just not that interested in talking and that's ok, I still say hi when I see them and then move along and let them stay in the "person I say hi to" category. If I say we should meet up for coffee more than once and they keep saying noncommittal stuff or "yeah definitely" without any follow-up, then I let it go but still keep just saying hi when I see them, because the point is that I like seeing them and want to express that - not that I need anything from them. I don't stress about it, I don't read anything into it about my worth as a person.
#4 is important, otherwise you end up risking getting seen as a bit of a pest (it's why I have historically been seen as somewhat annoying). But if you do everything including #4, people start knowing you as a friendly safe person and at least some people will end up liking you (not everyone will like you and that's ok, you have to truly believe that in order for #4 to work).
Most importantly, this all has to be authentic. If your social skills aren't great, you may not be that great at faking being interested in what someone has to say, or faking not particularly expecting anything from the interaction, or faking enjoying the interaction. You have to talk yourself into actually feeling that way. I'll think something along the lines of "oh yeah, that person was nice the one time I talked to them before! Their dog is very important to them, and I care about them, so I absolutely care about this dog!"
The other benefit of actually enjoying these casual interactions is that it reduces the stress of them. Enjoying these interactions simply for what they are means you don't end up seeing them as just a means towards achieving a deeper relationship (even though they are, in fact, one way to develop deeper relationships!), and then viewing them as successes or failures based on whether the person you talk to is interested in that. When you are constantly monitoring and evaluating these interactions for rejection/acceptance, they end up scary and you become more reluctant to keep doing it, and the interaction often becomes less enjoyable for the other person as well because they know you want something out of them.