How should I respond to this hateful email I received?

Ignore him, he's old fashioned, and extremely immature. You and everyone LGBT knows that you can't help how you feel, this f***** probably has a bad marriage or something and is jealous of you in some way or another. There are plenty of straight people to 'further the advancement of the human race', but gay people shouldn't have to be a part of that, as they have no attraction to the opposite . Don't be ashamed of who you are.