As a tank players pugging with all tank classes outside my main (BrM) this always make me laugh. I'm not here to lead a PUG without any power on it. You have the leader tag, you lead. Period.
I may destroy his pug if he really piss me off by saying "I'll start a real PUG in a few minutes, named "XXXXXXX", because leader is obviously clueless. come join me if you're good" before leaving.