There are online groups that will try to provoke people into giving them a reaction. You call people derogatory words and make them feel uncomfortable. If you can easily provoke a reaction out of them, they are outsiders unfit for the group you want them to partake in. If they react by "correctly" responding to those provocations either by insulting back in a joking manner, or directly referencing something regarding those words, you know that they're fit to be in your group.
I really hope there's other people in this thread who know about this practice.