50NL: AK UTG gets re-raised by the button

[O.T.G.]

Villain is 13/6/3. Is it standard to just fold here and not bloat the pot OOP? Flat calling seems like the worst option.

Full Tilt No-Limit Hold'em, $0.50 BB (8 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($50)
UTG+1 ($9.15)
MP1 ($46.15)
MP2 ($48.75)
CO ($68.60)
Button ($56.30)
SB ($26.05)
BB ($117.35)

Preflop: Hero is UTG with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to $1.75</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">Button raises to $6</font>, <font color="#666666">3 folds</font>.

Final Pot: $4.25