50NL fold Aces here? (ugh I hate saying that!!)

[RapidEvolution]

Villain is 21/10/1 over 300 hands and I've seen him around a bit..I haven't seen him get spewy or out of line so far.

$0.25/$0.5 No Limit Holdem
8 players
Converted at weaktight.com

Stacks:
Hero (<font color="#0000cc">$63.60</font>)
UTG+1 (<font color="#0000cc">$10.00</font>)
MP1 (<font color="#0000cc">$53.00</font>)
MP2 (<font color="#0000cc">$68.20</font>)
CO (<font color="#0000cc">$34.50</font>)
BTN (<font color="#0000cc">$35.20</font>)
SB (<font color="#0000cc">$38.90</font>)
BB (<font color="#0000cc">$95.40</font>)

Pre-flop: ($0.75, 8 players) Hero is UTG A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img]
<font color="#cc0000">Hero raises to $2</font>, <font color="#777777">2 folds</font>, MP2 calls $2, <font color="#777777">4 folds</font>

I'm usually pretty tight UTG so the downside is that a thinking villain can put me on a pretty narrow range.

Flop: 6[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/club.gif[/img] ($4.75, 2 players)
<font color="#cc0000">Hero bets $3</font>, <font color="#cc0000">MP2 raises to $6</font>, <font color="#cc0000">Hero raises to $20</font>, <font color="#cc0000">MP2 goes all-in $66.2</font>, <font color="#777777">Hero ?</font>

When villain minraises my flop raise, I basically narrow him down to sets and overpairs (and possibly 2 pair if he happens to be the type to call a raise with ATC when stacks are deep...though I think this is done much more when the other player is in position). I thought he'd raise more with a set, so I repop him to 20 and he shoves. Do we find a fold here given villain's low AF and line so far?