ATo misses flop vs LAG PF 3bettor

[SNOWBALL138]

CO is 52/15/2 over 40 hands or so. CO is also down 11BB since I've been at the table. Does anyone play this differently?

Party Poker 2/4 Hold'em (6 max, 8 handed) FTR converter on zerodivide.cx

Preflop: Hero is MP2 with A[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">CO 3-bets</font>, <font color="#666666">3 folds</font>, Hero calls.

Flop: (7.50 SB) 3[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero folds.

Final Pot: 4.25 BB