I felt it was quite rude to assume what ones sixual preference is. And I'm role playing an easily offended Ork so this was inevitable. Lots of NPC's have been killed for a lot smaller things. Saying "hay, watch it" being the main reason
As stated earlier, pre-modern era, homosixuality was "normal". Married men routinely had partners of both sixes, etc. Modelled after those cultures, it would not make sense for your Orc to freak any more or less than he would freak if a woman liked him. That's on you, not your PC. Someone hitting on you is NOT a reflection of YOUR preferences, but THEIRS. That's a VERY important distinction that many, many, many straight people, usually males, usually young, fail to realize. He doesn't necessarily THINK you're gay as much as he HOPES you're gay. In OUR world, that still is, unfortunately, a HUGE risk for a gay man to take sometimes. Point being, if a man hits on me, I admire his courage, and let him know that, and politely decline any "offers". Would that we lived in a world where this conversation didn't even need to take place.