AA Facing Min-Raise Postflop: Tarzan or Jane?

[Double Eagle]

This is a hand from the end of the first hour of last night's $109NL on Party. Villain has shown himself to be fairly loose pre-flop but has not gotten out of line post-flop.

Villain is playing this like a set, should I give him credit for it?

Party Poker No-Limit Hold'em Tourney, Big Blind is t50 (10 handed) converter

Button (t3510)
SB (t1205)
BB (t890)
UTG (t630)
UTG+1 (t835)
Hero (t1555)
MP1 (t1330)
MP2 (t5225)
MP3 (t2130)
CO (t1185)

Preflop: Hero is UTG+2 with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t150</font>, <font color="#666666">3 folds</font>, CO calls t150, Button calls t150, <font color="#666666">2 folds</font>.

Flop: (t525) T[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t300</font>, CO folds, <font color="#CC3333">Button raises to t600</font>, Hero????