Not offended, but it seems to me that this is what the secret in question was about -- the guy is annoyed that slash fans do this with gay men. Maybe not all slash fans (*I* sure as hell try not to) but enough do play to the stereotypes that I can understand why the guy is sick of seeing it. Because in fandom, it's not always a question of "Don't like, don't read" or simply avoiding what's bothering you because in some fandoms it is ever present.