[soah]

Calling is crazy. You're out of position and he barely has more than 10% of his stack in the pot. There are tons of ways that he can end up getting away very cheaply postflop but if he outflops you there's not much you can do to get away. If he knows how to fold KK preflop then he surely knows how to fold it postflop too when needed.

This is also terrible in the grand scheme of things because in the future he knows that he can get away with reraising you with a wide range of hands and still get a flop with them. How would you feel when he's making this move with 77 or 98s, knowing he can either get you to fold, or get a chance to stack your big pair?