Opponents Play: Good, Bad Or Borderline?

[bkm]

$10+1 Party Poker No-Limit Hold'em Tourney, Big Blind is t500 (2 handed) converter

Button (t4950)
Hero (t3050)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
Button calls t250, <font color="#CC3333">Hero raises to t3050 (All-In)</font>, Button calls t2550.

My opponent had been playing a good, aggressive game. So, I was rather surprised when he called with 6 [img]/images/graemlins/heart.gif[/img] 2 [img]/images/graemlins/heart.gif[/img].

My initial response was that he misclicked or made a really stupid move. But, assuming that he didn't misclick, was it a stupid move? SNGPT says he should've pushed. But, I guess, he wanted to see a cheap flop, but was willing to call any raise.

He can figure that if I don't have an overpair or have him dominated he's going to win about 35% of the time. So, about 1 out of 3 times he wins the SNG this hand. 2 out of 3 times he loses the hand, but still has nearly 2000 chips and 1 double up nearly even things up. So, it may not be a bad move, but is it a good move or just an OK move that fits his aggressive style of play?