I don't think I've ever heard of republicans talking about "how awful gay people are." But by all means go beat up that straw man and forget the fact that by supporting gay marriage you are basically asking the state to promote and subsidize sodomy.
Maybe some day they will cross the line and start trying to subsidize something you do care about. But by then perhaps people will be demonizing you and saying you can't win forever by talking about how awful people who have sex with animals are. Of course, by then you'll probably go along with it to avoid being called a bigot.