Pacific. Full Ring. Full stacks. MP opens to like $8. I usually reraise here but just called iwht KK.

Flop comes 525 Pot ~20. He leads for 20 and I raise to like 50. He reraises to like 90. easy push or lay down?

Easy push. You smooth called preflop in order to get him to bet post flop. It worked. If you weren't going to play it all in post flop, you should have raised preflop. Thus by your own action you create the need to get all in here. He's got QQ or AA. So you have a 50-50 chance and you're getting better than 50-50 on your money. If he sucks, he might have JJ or TT, which makes it even more of a call.

Pushedy pushedy.

If you trap with KK you can't be surprised when the other guy thinks he's ahead of you with his QQ or JJ. If you were scared of AA you have to reraise preflop and then fold to a push at that point. As played, there is no way he puts you on KK.