To look on the bright side, bad players often quit the groupe by themselves before you have to kick them and without even having said a single a word (no hi but no insult either).

if the tank leaves your group, just let the dungeon finder replaces it for you, you'll be at the top of the queue so it will usually be a matter of seconds before you get a new one.

That being said, I've been avoiding pugs like plague for a while, because I hate "rushing" stuff without anyone ever saying anything. If there is to be no social interaction at all, I'd rather play alone