$33 - KK facing strange action on paired board

[Fishing2do]

Full Tilt Poker
No Limit Holdem Tournament
Blinds: t50/t100
7 players
Converter

Stack sizes:
UTG: t1700
UTG+1: t1095
MP1: t1685
Hero: t2585
Button: t1375
SB: t1070
BB: t3990

Pre-flop: (7 players) Hero is CO with K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img]
3 folds, <font color="#cc0000">Hero raises to t250</font>, 2 folds, BB calls t150 <font color="aaaaaa">(pot was t400)</font>.

Flop: 6[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/heart.gif[/img] (t550, 2 players)
<font color="#cc0000">BB bets t100</font>, <font color="#cc0000">Hero raises to t500</font>, <font color="#cc0000">BB raises to t1000</font>, <font color="#cc0000">Hero is All-in</font>

The villain is a really big losing player, havent got hand stats on him.

Obivously my line is correct untill I overpush his minreraise. I cannot call his reraise right? His line is so strange that you'd either think hes just playing his lower pocket pair stupidly or he has a monster. Its hard to tell because he's a really bad player.. Am I ahead here often enough to make this +EV? (also considering my Tournament status, 2nd in chips &amp; losing to a bad player sucks.).