400NL - fold top and bottom two on the flop ?

[Mat]

Villain is 20/16/3 (183h), I haven't played with him before but I don't play at these hours usually and he seems like a good reg, thinking player.
On this session we have almost no history, I have 3-bet him pre 1 or 2 times and I haven't been overaggro with him, I can't even remember having raised one of his c-bets.

Everest Poker No-Limit Hold'em, $2.00/$4.00 (HH Converter by Kreatief)

CO (777.00)
Button (417.40)
SB (559.20)
BB (333.90)
MP2 (86.00)
MP3 (400.00)

Preflop: Hero is Button with A[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img]
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $16.00</font>, Hero calls $16.00, <font color="#666666">2 folds</font>,

Flop: A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img] ( $38 )
<font color="#CC3333">CO bets $28.00</font>, <font color="#CC3333">Hero raises to $100.00</font>, <font color="#CC3333">CO raises to $338.00</font>,

I very well could be behind his range here, this is not an appropriate flop to 3-bet with air and it seems to me like he wouldn't do that with AJ or AQ (stupid play right ?) but the board is drawy so I don't know.
It's really weak to fold there, isn't it ?