It's funny because I do kind of the opposite of you, OP. In the fandom I'm in now, they frown upon incest which is my pairing of choice. So I made a different AO3 from my main to post my more explicit incest fics. But I still comment on other peoples' incest fics from my main account. ¯\_(ツ)_/¯ I kind of give a fuck in where I don't want hate on my main AO3 and Tumblr, but somehow leaving comments is okay for me? I dunno, I'm weird.