Where is the horrible mistake?

[smoore]

ugh, just ugh.

I have no read on the opponent, he sat down 6 hands ago and hasn't played a single one. I'm sure this is a bad call preflop, I played it horribly weak-tight. I think I should have just pushed preflop and hoped for the best. Who pushes preflop here? Does anyone actually fold? And of course, everyone calls the flop bet because of the odds. I'm a dumbass and yes, this hand basically ended my tournament.

PokerStars No-Limit Hold'em Tourney, Big Blind is t800 (9 handed) converter

MP2 (t5464)
MP3 (t13874)
CO (t2382)
Hero (t14825)
SB (t10249)
BB (t13920)
UTG (t9266)
UTG+1 (t4185)
MP1 (t7901)

Preflop: Hero is Button with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">6 folds</font>, <font color="#CC3333">Hero raises to t3200</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">BB raises to t5600</font>, Hero calls t2400.

Flop: (t11550) 7[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t4000</font>, <font color="#CC3333">BB raises to t8270</font>, Hero folds.

Final Pot: t23820

edit: my "gut" told me he had AQ when he reraised me. Could have been jacks, could have been AK, dunno. still pissed at self.