BB flop 2 pair and c/rd on river, too nitty?

[Archon_Wing]

Villian is 63/5 standard micro limit calling station.

Poker Stars
No Limit Hold'em Cash Game
$0.02/$0.05 Blinds
4 Players
LegoPoker HH Converter

SB: $12.88
<font color="black">Hero (BB): $10.00</font>
UTG: $12.38
BTN: $10.42

<font color="black">Preflop:</font> Hero is dealt 8 3 (4 Players)
UTG folds, BTN calls $0.05, SB calls $0.03, Hero checks

<font color="black">Flop:</font> ($0.15) 3[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/heart.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $0.10</font>, BTN folds, SB calls $0.10

<font color="black">Turn:</font> ($0.35) 6[img]/images/graemlins/spade.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $0.20</font>, SB calls $0.20

<font color="black">River:</font> ($0.75) 5[img]/images/graemlins/heart.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $0.35</font>, <font color="red">SB raises to $1.25</font>, Hero folds

Pot Size: $2.35 ($0.05 Rake)

So I saw the river and was like "Gee, if I was a donk I'd so check raise the river. I'm going to get so pissed." and so he does... But someone so passive could do this with an overpair too. Also, I was stealing quite a few blinds from this table. Turn bet should be a little larger as well.