When I encounter anyone being sexist, misogynistic, racist, homophobic or just plain ignorant.
Me *makes belittling baby voice* I know who's a stupid ignorant fuck face. Do you know who? Who's a stupid ignorant fuck face? YOU'RE A STUPID IGNORANT FUCK FACE!!! Oh yes you are! You're so good at being a stupid ignorant fuck face. Wow look at you being stupid fuck.