This acts much like a gaydar, in that it is totally intrinsic, and based on the interpretation of information one is given.
Larry: "It's got to be the name 'Steve'. What a stupid name. Anyone called Steve should be either killed, or made to eat their own shit!"
Steve: *suspects Larry is just trying to annoy him* "You're trolling me aren't you?"
Larry: "Yes I am. Good to see your trolldar is working"...