vs that nitty guy are you 4-betting? I hate flatting vs such nit, as we are going to miss a lot. Since he is nit be might fold TT-JJ to a 4-bet, while he could keep betting those post-flop after we miss.
My general hypothesis is that people flat AQs vs 4-bets, sometimes AQo, depending on player some random suited aces that they can't fold. 99-JJ too if they don't want to gii preflop. There also could be some AKo.
So what do you do OTF? Do people float AQs with backdoor flush draw here if we bet small?
When he donks like that he probably has something?

OnGame - $0.50 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

SB: $46.27 (VPIP: 21.46, PFR: 16.42, 3Bet Preflop: 5.98, Hands: 827)
BB: $49.25 (VPIP: 21.79, PFR: 16.12, 3Bet Preflop: 8.29, Hands: 1,378)
UTG: $102.04 (VPIP: 50.00, PFR: 16.05, 3Bet Preflop: 9.52, Hands: 168)
Hero (CO): $38.12
BTN: $114.90 (VPIP: 23.97, PFR: 18.87, 3Bet Preflop: 7.91, Hands: 1,933)

SB posts SB $0.25, BB posts BB $0.50

Pre Flop: (pot: $0.75) Hero has A K

UTG calls $0.50, Hero raises to $2.00, fold, SB raises to $6.00, fold, fold, Hero raises to $13.00, SB calls $7.00

Flop: ($27.00, 2 players) 3 8 5
SB checks, Hero checks

Turn: ($27.00, 2 players) 6
SB bets $15.00, fold

I think you being a little wide on you 4 bet flatting ranges in my experience unless villain is completley tilted or you are both deep its going to be premiums i dont think AQ calls very often so your looking at QQ+ AK possibly JJ. - your not deep enough for him to get cute with any SC or PPs bellow JJ

Tha hand in question im just flatting the 3bet and since you 4bet and he called alarm bells would be going off in my head AA,KK, you are playing less that 100bb deep though so i would be just be looking to get in in pre vs you with these hands as it seems that you want to go with you hand? are you ever 4bet folding here

I dont think a nit 3bets TT or JJ here he would probably flat a high % of the time.

you hand is to strong to fold and not stong enough to 4bet imo just flat and play a flop sure you will miss a large % of the time

just seen his stats he doesnt actually seem that nitty 21/16.5 - 6% 3bet is not that tight more tag than nit although his 3bet is a little low but only a % point or so

to sum up i wouldnt 4bet as his hand is weighted towards value hand only in this spot, your line looks strong pre but you have just bloated the pot your SS and left yourself no leway to make a cbet and fold

post flop looks fine

also you have 800 hands on him do you not have any reads?

Good that you noticed. I have been autopiloting way too much lately.
My reads are: Doesn't play above 50nl.
"very passive
stabbed once bvb x down
slowplay"
He is folding to cbets 63%, which is high.

what where your thought when he 3bet did you think he was just trying to take you off your hand because your obviously isolating the fish pretty wide

4b is fine here, wouldn't label this guy as a nit.

6% total 3bet isn't nitty, KK+/AK make up about 2.5%, not to mention AK blocks all those hands.

It may be good to pull up the extended HUD and look at his SB 3bet vs Btn stat as well, if you're not paying enough attention to do that you should play less tables.

postflop is fine

Sample is relatively small, can see that he is 3-betting SB 9% BB 6%, sqz 4%. This situation is also a little different, as i was isolating the fish.
I hate this kind of player, as i can't flat much pre, while 4-betting sucks also, even with AKo.
so we could flat, hopefully we get money in on A/K-high flops. Have no idea how often he x/f. he cbet in 3-bet pots 44% (4/9) while he also has high xr. we won't be flopping good draws, so we have to bluff A-high a lot.
Given all that, i have no idea which is better. Call and hope he was 3-betting AQ KQ AJ, we miss so often and chance we both flop pair is same as flopping set. If he has QQ JJ we get one bet on the flop. 4-betting is slightly +EV i think. 6.5% is the margin where it becomes profitable. i assume this kind of player doesn't spazz with AQs, so we only gii vs AK, QQ+ maybe JJ