i mean i'll just say that this guy reminds me of me before i understood what was wrong with me. i'm gay and i have ptsd and i'm sure i confused the f*ck out of my female friends because i'd do things like that all the time and then i'd zone the f*ck out because i upset myself or something.
or i just didn't like what was happening or i was really uncomfortable but then i'd try and compensate and be even worse, and things. so by their view i was literally particpating, making jokes, flirting back, and then all of a sudden i was like "this is bad! i hate this! bye!" and i'd just like, run away, or i'd get mad and blow up, or i'd zone out, or whatever.
there's a lot of ways that straight women in particular tend to interact with gay guys-and in my experience i haven't heard too many people that actually mind it but i'm a survivor of sexual abuse (you mentioned that mighit be an issue for him as well)
and i've always found it very uncomfortable and upsetting, the way people would talk to me and things. the bounderies between straight women and gay men are a little different i've found, but not in the same way that women relate with their female friends.
in my experience women are actually more lewd with us, because they are just that way but they worry about being judged and things by their female friends so they "let loose" more with their gay male friends because they feel like, blah blah, this is all social dynamic stuff.
it might be interesting, it might not-these are my observations, they're not like, science.
the point is, and it obviously isn't every friend group and every circumstance but it at least happened often enough to me, personally, that i've noticed it. and i'd try and over correct and participate socially and it would always turn out like this-weird and strange and contradictory and downright disturbing at times.
these days i have good bounderies so i just tell people i'm not interested in that kind of discussion and they get all uncomfortable and mad at me but they move on.