Do I stack off here? (Deep)

[Nemesis69]

Game: $0,01/$0,02 6MAX

Stacks:
SB: $3
BB (=Hero): $5.40
UTG: $2
MP: $2.41
MP+1: $1
CO: $3.87
Button: $6.20

Preflop:
Hero is dealt 9 [img]/images/graemlins/heart.gif[/img]9 [img]/images/graemlins/diamond.gif[/img]

UTG folds, MP folds, MP+1 folds, CO folds, Button raises to 0.08, SB folds, Hero calls

<font color="blue">I just called because I knew villian's opening range was pretty tight, even on the button. </font>

Flop(pot $0.17):
6 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/heart.gif[/img]8 [img]/images/graemlins/club.gif[/img]

Hero checks, button bets $0.15, Hero raises to $0.50, button shoves, I instacall.






But I think this is -EV. Because the strong line villian took I was pretty sure of an overpair.

If had 10 outs, so I was an underdog against an overpair.

Are we folding this against nits? Or do we have to call?