AA facing heavy resistance on 4 high flop - 200nl

[aislephive]

No reads on villain other than he is somewhat laggish 24/18 and pretty aggressive. Without a read that villain leads with sets, I'm compelled to call this right?

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($198.65)
MP ($98)
Hero ($199.70)
Button ($233.96)
SB ($176.18)
BB ($227.80)

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img]. SB posts a blind of $1.
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $7</font>, <font color="#666666">2 folds</font>, BB calls $5.

Flop: ($15) 3[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $15</font>, <font color="#CC3333">Hero raises to $50</font>, BB raises $205.80 (All-In), Hero instacalls???