100nl KK is a fold weak?

[brandysbich]

Poker Stars - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $106.40
BB: $100.05
Hero (UTG): $132.45
CO: $134.65
BTN: $101.10

Preflop: Hero is dealt K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] (5 Players)
<font color="red">Hero raises to $4.00</font>, CO calls $4.00, BTN folds, SB calls $3.50, BB calls $3.00

Flop: ($16) 7[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] (4 Players)
SB checks, <font color="red">BB bets $9.00</font>, <font color="red">Hero raises to $23.00</font>, 2 folds, <font color="red">BB raises all-in to $96.05</font>, Hero??

Pot Size: $135.05 ($2 Rake)

I hate to be one of those players that can't get away from an overpair but I think i'm taking it too far lately. I c/r him with 2 other people in the hand, so what is he shoving with here?