I am going to assume that by he you mean aggressive players. If not correct me.
When someone Folds every hand but premiums to a steal it makes the steal profitable with any two cards. This happens a lot more at 6 max then full. Anyways there are multiple different ways to combat depending on how the he plays Post Flop. (ie... weak 3 bet, call- check raise flop) 3 bet is probably my go to move. He should get smart and weak 4 bet but not at these levels