You are really not overracting. There are two problems here - at least - first it's just plain rude to talk like that, and second it's not as if gays and lesbians are a uniform group! "What do your kind do in that situation" - I'm sorry, that's frighteningly uninformed. Unless the situation she's asking about is "needs to go to the bathroom" when the answer would probably be "go to the bathroom". But I bet that's not it.

It's not even as if all therapists (which is a much smaller and much much more uniform group of people than gays and lesbians) react to the same situation in the same way. I hope you are able to call her out on this.