The courts have already said that one must simply declare oneself to be a homosexual to be treated as one.
Well then. There's your solution to bullying.
Tell the bully who has you on the top of his list that if he persists, you'll write a letter to the US Justice Department, naming him as someone who revels in bullying gays.
If said bully has half a brain, he'll do anything to avoid that shiite storm from coming down on his head.
Or better yet...don't tell him. Just write the letter.