I said arguing with you re: gay marriage is impossible if you don't agree that homosexuality isn't something you choose to do. It has nothing to do with you being a "master debater."
You're essentially admitting the only way to argue with me is if I agree with you to begin with, which would mean there wasn't an argument at all.
You are straight or gay long before you have any sexual contact with another person. It's not a choice.
Following that logic, where preferences are pre-determined, you also already know which foods are your favorites long before you ever eat them. Those people who are blind from birth should also already have a favorite color even though they've never seen colors. People deaf from birth probably have a favorite song too - since it's already pre-determined, they don't need to hear the song to know its their favorite.
Do you see how illogical your idea is? Probably not, because if you admit to your own lack of logic, your whole premise falls apart, so you'll probably choose denial.
It's no more a choice than being born with blue eyes or brown eyes is a choice. Dumbass.
You choose who you are with romantically and/or sexually. That IS a choice. Dumbass.