Oh puh-leez. Do you really think EVERYONE will turn gay? Would it be THAT easy for you to "turn?" By the way, natural means: occurring in nature.... so homosexuality IS natural whether you believe it or not.
They are frightened, unsure of their own sexuality they are afraid you will convert them.
It is their believe that homosexuality is a choice you make that drives this.
I have always been supportive of people that happen to be homosexual, I was around people when I was younger ( like high scho0l ) who were openly homosexual. I happen to be heterosexual and comfortable and sure of my sexuality.
I was approached, I just smiled and told them I was straight but thank you for the complement and they thanked me for saying it that way.
But the people you are talking to here, I dont think are that comfortable with their own sexuality