[LarryLaughs]

Lets try this approach.
What kind of stats would you need to have on your opponent to fold KK pf?

I have considered it a few times against this kind of opponent:

VPIP 9%, PFR 7%, Preflop 3-bet 2%.
Level is NL50.

I mean, 3-bet 2% would be about AA/KK/AK? and not always with AK even.

So, if he 3-bets with 2% range, would you call his all-in with KK in hand? In this case he would probably have even tighter range, or the same range if his intention is to always go all in if his 3-bet is raised.

It is possible to datamine enough to get, lets say 5000 hands of several regular "rocks" in NL50 and then consider folding KK. But that would be folding against very few opponents that you know very well.