I consider myself Tight/Aggressive verging toward loose when I think it will work.
When I come up against this type of player I tend to play supertight/passive not so I can be his friend, but so he will get overzealous and I can trap him for his whole stack when he bets out of line.
Never go after an agressive player, he'll hurt you for it.
Never "go after" a tight player. He'll get you in the long run.
Never go after a loose, weak player. He'll call you and send your variance through the roof.
only a timid, passive player can you "go after," but the best thing to do is play your best poker and not go after anyone.