I am gay, so any intimation from a man is uncomfortable for me to experience. But it gets upsetting when they ignore my response entirely and assume they just need to try harder. This type of guy doesn't ever come right out and say he's wanting to fuck me so I can't do much about it without looking like a bitch for assuming. If I respond to your initial compliment by making a face of disgust or discomfort, excusing myself from the conversation, mentioning an LGBT event I'm involved in, saying verbally "That's weird" - or really by doing anything other than actively reciprocating with flirting of my own, then stop. Wait to see something before you just plow ahead. Flirting is meant to be a two-way exchange, not an assault on a passive woman.