NL25 - AA faces suspicous amount of aggression from decent reg

[Ironic]

PokerStars No-Limit Hold'em, $0.25 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($22)
UTG ($24.75)
UTG+1 ($26.50)
MP1 ($24.95)
MP2 ($24.35)
Hero ($25)
Button ($24.65)
SB ($17.20)

Preflop: Hero is CO with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">MP1 raises to $1</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $2.5</font>, <font color="#666666">1 fold</font>, SB calls $2.40, <font color="#666666">1 fold</font>, MP1 calls $1.50.

Flop: ($7.75) 5[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">MP1 bets $5.75</font>, Hero calls $5.75, SB folds.

Turn: ($19.25) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP1 bets $16.7 (All-In)</font>, Hero folds.

Final Pot: $2.55

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Villain 10/6/4.5

On another table earlier I saw him raise to $2.5 preflop with KK.

I am seen as 14/6/2.5 roughly so my image is tight. He should know I have a premium pocket pair.

Standard fold?