Weak-tight two pair?

[Supern]

Texas Hold'em No Limit $0.10/0.20 - 8 players

Players:
Hero (BTN) ($23.66)
MP ($19.07)
Villain (BB) ($20.02)

Hero was dealt: A[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img]

MP calls, Hero raises 0.80, Villain calls, MP calls

Flop (3 players, $2.50) 9[img]/images/graemlins/heart.gif[/img] - Q[img]/images/graemlins/spade.gif[/img] - A[img]/images/graemlins/diamond.gif[/img]
Villain check, MP check, Hero bets 1.50, Villain raise 3.00, MP folds, Hero calls

Turn (2 players, $8.50) 5[img]/images/graemlins/diamond.gif[/img]
Villain bets 3.50, Hero folds

Opponent is loose-passive. This is his only ch-raise I have on him and I have 200 hands on him. When I think about it now it seems like a terrible fold. Should we ever be afraid of 99 here?

How do you handle two pair hands against aggression?
I have trouble playing them when they get very aggresive.