Villain had a triple stack, but was a major donk. I had $102 at 100NL

I'm in middle position with Aces.

UTG Limps
I raise to $5
Button calls
Donk min-raises to $9
I 4-bet to $21
Button folds
Villain min-raises again to $33
I 6-bet all-in.

He obviously calls and show.... Kings, right?

Nope. Pocket 6's

Board:

Nice hand sir, nice hand

You just have to laugh and reload.