AQs UTG, I struggle with turn donk bets like this

[RustyCJ]

no reads, fairly new to the table here, I assume SB is a typical Party moron.

Party Poker 0.50/1 Hold'em (6 max, 5 handed) FTR converter on zerodivide.cx

Preflop: Hero is UTG with Q[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises</font>, MP calls, <font color="#666666">1 fold</font>, SB calls, BB calls.

Flop: (8 SB) 7[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, BB folds, <font color="#CC3333">Hero raises</font>, MP calls, SB calls.

Turn: (7 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>

I have about 10k hands in .5/1 6max now and bets like this terrify me, so many times i'll see A7 or A2