As a lesbian, I've been asked this question many many times. I have also met lesbians that do not accept gay men. Like hello? We are both in the same ship here, we are both discriminated against and more importantly we both had no choice as it is simply who we are.
As for my reply... "As long as I'm not in the middle; I don't care."
I do however not like when gay guys look too feminine as I don't think sexuality should change one's physical appearance to that extent.
It's not about choosing a certain gender, it's about choosing happiness over society. .