I would tighten up, but play back at them really aggressive when I have the goods.

If they are raising hard preflop, I wait for premium hands and then put the pressure back on them.

If they are playing very aggressive postflop, you need to have a hand, but then dont be afraid to play back at them reraising and pushing.

From my experience, the more aggressive their style, the more problems they have when someone puts aggression back on them.