99 vs LAGtard in 3 bet pot

[Phildo]

Villain is 60/23/3 after 90 hands. He also didn't fold the blinds once out in 90 hands and his attempt to steal is 21 so I don't think he is positionally aware at all (so I think he will call my preflop reraise with a ton of hands he shouldn't).

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

Hero (CO): $91.45
BTN: $10.45
SB: $13.15
BB: $48
UTG: $50
MP: $57.05

Pre-Flop: 9[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/spade.gif[/img] dealt to Hero (CO)
UTG folds, <font color="red">MP raises to $1.75</font>, <font color="red">Hero raises to $6</font>, BTN folds, SB calls $5.75, BB folds, MP calls $4.25

Flop: ($18.50) 3[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/spade.gif[/img] (3 Players)
SB checks, <font color="red">MP bets $18.50</font>, Hero ???

Calling doesn't seem to accomplish much of anything. My gut reaction is fold but the guy is such an idiot I don't know if that is the right play.