How was my opponents play here?

[nuclear500]

I know what I should have done differently on the hand (push the flop) but I'm more 'concerned/interested' to know what you all think of my opponents play here. Am I wrong to believe he should have folded the flop?

PokerStars No-Limit Hold'em Tourney, Big Blind is t3000 (7 handed) converter

MP2 (t55274)
CO (t76305)
Button (t28200)
SB (t88557)
BB (t39603)
Hero (t53038)
MP1 (t12740)

Preflop: Hero is UTG with T[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to t12000</font>, <font color="#666666">4 folds</font>, SB calls t10500, <font color="#666666">1 fold</font>.

Flop: (t23400) 5[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t6000</font>, <font color="#CC3333">Hero raises to t20000</font>, SB calls t14000.

Turn: (t63400) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets t6000</font>, <font color="#CC3333">Hero raises to t20888</font>, SB calls t14888.

River: (t105176) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: t105176