NPTK facing weird bet

[wems]

No real reads on villian... except when i stacked one guy he made a smartass comment towards villian. (if that counts)
I really dont like this bet, I feel like hes chasing a flush, and he misses his flush so he makes this donk bet on the river to make up for it.
obv calling is out of the question.
would a re-steal be okay here?

Full Tilt Poker, $0.50/$1 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

BB: $60
UTG: $91.50
CO: $178.90
Hero (BTN): $314.95
SB: $103.15

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BTN)
UTG calls $1, CO folds, <font color="red">Hero raises to $4.50</font>, 2 folds, UTG calls $3.50

Flop: ($10.50) 2[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] (2 Players)
UTG checks, <font color="red">Hero bets $7</font>, UTG calls $7

Turn: ($24.50) 9[img]/images/graemlins/spade.gif[/img] (2 Players)
UTG checks, <font color="red">Hero bets $16</font>, UTG calls $16

River: ($56.50) K[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">UTG bets $25</font>, <font color="red">Hero ???</font>