Hi! Its strange but i d fold on the flop. People usually dont play the tough guy on AK high boards and never bluffing so his potraise is AT LEAST AK! But more likely a set (even AA coz stacksizes he had not 4bet)

AKTT vs AA,KK,77,QJT,AK has 38.95% equit
Remove AK from his range and it goes down to 30ish.
If only Sets you have 20ish. So yeah you do have 40% IF he does this with both top 2 pair AND straight draws. Ofc some guy might do this with A7xx and folding if you jam back but the problem is that on these stakes people call WIDE but POT with the nuts like 90% off time so without reads its a tough but correct fold IMO. If it was like 50 bb's and below you can call but Ithink anything above 60/70 bb's you gotta throw it away.

Feels gross but I think it's a fold as well for the exact reason you mention. You rep so strong here 3b the UTG. I'm guessing your 3b % in this spot is very low, assuming the UTG is not a crazy fish (then I don't like the fold either) so you will actually have AA here quite often.