25NL Folding two pair on the river vs Rock

[stuartharris]

Villain is 23/5/0.3 for 43 hands and has been extremely passive, once calling all the way with an overpair (KK) and another time calling all the way with a set. Is this a reasonable fold?

Ultimate Bet No-Limit Hold'em, $.25 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

UTG ($54.13)
UTG+1 ($15.83)
MP1 ($6.90)
MP2 ($23.18)
MP3 ($12.67)
CO ($9.82)
Button ($22.63)
Hero ($6.16)
BB ($38.60)

Preflop: Hero is SB with 2[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">7 folds</font>, Hero completes, BB checks.

Flop: ($0.50) 9[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.25</font>, BB calls $0.25.

Turn: ($1) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, BB checks.

River: ($1) A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.5</font>, <font color="#CC3333">BB raises to $2.5</font>, Hero folds.