Got trashed for this one

[droolie]

SB is a LAG. He's been whinging and pissingh off the table everytime someone draws out on him. He didn't make it to showdown that often though and seemed like he could find a fold when necessary.

Party Poker 1/2 Hold'em (6 max, 5 handed) converter

Preflop: Hero is UTG with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, SB calls, BB calls.

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

Turn: (4 BB) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

River: (4 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls.

Final Pot: 6 BB

How bad is checking this turn? My opponent berated me for a while after this hand ended.