I'm always in love with when they pull the "homosexual is NATURAL" card.

Because then I remind them that most homosexual acts in nature are stronger men beating weaker men and fucking them to show dominance. Which usually makes them, who are always smaller than my gargantuan self, realize the implications of and ends the conversation.

Or with women, the prevelance of rape in nature in general. So much so that ducks evolved special vaginas for it and dolphins doing it is a sign of their intelligence.