Pre flop is fine calling the 3bet BvB, flop is an easy fold, not getting odds and are most likely up against AA/AK or something similar given their overbet.

Are you capable / intending to take this pot away from this player on boards you miss but can pressure their range and can you get folds? If not, fold pre. You cannot be flatting 3b here intending to fit / fold flops. You must have some capacity to get them to fold / float flops bet turns etc. and if you don't then this kills one avenue of you winning the pot, which leaves making nuts and being paid, which doesn't happen often enough.

Similar with the A6hh we have reverse implied odds - we make our hand and get stacks in losing. KT3 / Q68r and the money goes in KQ should be in bad shape, but you called made TPGK and had an SPR (stack to pot ratio) of 4 so you have a bet bet flop and turn or bet/raise flop and stacks are in. Are you folding KT37r on the turn to an all in? Are you good in this spot? Can you take the hand away from them on a J936r board?

If you see KQ see nice hand raise then see the 3b see KQ and think nice hand call this is the wrong approach to playing the button. You must use position, and I don't think here against this player you can.

Defending KQ to a 3 bet in position is fine.

Because of the size of his shove you are just priced out. If he's really bad of course he can have some random bare Kx 9x combos, but he still has everything else which crushes you.

Preflop I'll defend KQs easily, but for the size after your ISO size,KQo I'd probably still fold for 1.50, but that's just me.

Yeah looks like a true whale. Have you seen him shipping boards randomly very frequently previous?

If so then make an easy call. But other than that then it's a bit of a gamble for this price.

Calling the 3bet with KQ here is 'ok' I suppose, but not great, because we need to remeber even a blind squirrel can find a nut sometimes.

I don't know the opponenet's 3bet % or how often they played hands like this before so can't really say much in a vacuum.

Personally, I would play my 'If in doubt, get out,' card here, this is just so rarely a bluff if they player is a weekend warrior.

Gl Juan.