Keep it as cheap as possible, until you know you have it. If I had the 2 3, I would probably play it the same way he did. If called, I would back off, assume I am probably beat and fold to any bets above minimum. In this case, a minimum bet was made - I would have raised and folded if reraised. If I had stayed in, I would have raised to see where I really was in the hand. If I had the Kings, if someone bet half the pot at me, I’d probably fold unless I didn’t believe the player. If called, I’d check on the river and fold to an all in bet with 2 straight possibilities on the board. I would make a continuation bet on the turn, and if raised, I would fold assuming someone had Broadway. Try to take down the pot before someone makes a better hand.
Since no low is established on the flop, if I had the Aces, I would lead with a half pot or pot size bet. I wouldn’t have raised with any of these hands preflop, but I’d play the rest differently.