Folding KK to LP

[Roy6]

I'm quite new at the table.
I once saw this player limping TT UTG, and just check-calling down on a 2 [img]/images/graemlins/heart.gif[/img] 7 [img]/images/graemlins/heart.gif[/img] 6 [img]/images/graemlins/diamond.gif[/img] flop.
Do you think this information is enough and can justify a fold flop? When I folded I insantly felt bad about that and thought that the fact that he doesn't defend made hands, doesn't mean he won't bluff with draws.

Party Poker 3.00/6.00 Hold'em <font color="#0000FF">(6 handed)</font> link

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

Flop: (6.00 SB) 7[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, BB folds, <font color="#CC3333">UTG raises</font>, Hero folds.

Final Pot: 4.50 BB.