Stupid vs 70/30 maniac?
Maniacs are fun - and profitable.My approach - firstly try to pick up betting patterns to their bluffs/monsters etc, so that you can be ready to dance with them.Play tight or avoid them until you can whip them with a big hand.Now that you have shown him u only play the nuts then it is time to fight back.Raise every time he limps for a few hands and put the pressure back on him - soon he'll be looking for a new table.In short punish his looseness by playing good cards aggressively
If you're not pissed off at the world - you're just not paying attention