What? This is unacceptable! You have to get off your computer and go straight up to them (no pun intended) and tell them straight (once again, no pun intended) and tell them you like guys. Just because they are gay, doesn't mean that you have to be, you weren't born that way. You have to tell them to stop, for your own good. If they are good parents, they will stop this madness. So please, go talk to them.
p.s maybe there joking? I mean do they look serious when they talk to you about meeting this girl?