Why can't you call, hit top pair and solid kicker, win a decent sized pot. Or, call with AQ or 66 and totally miss the flop but call down a player if you feel he'd lead with nothing? Also, if he's that aggressive, you'd be wise to try and hit a small set and win a big pot from him. I don't understand why you can't just play the flop, even though it is online. I hate three betting from out of position without a monster. I like taking flops, that is where I'm most comfortable at determining his hand range, etc.