No, i would never fold KK preflop, even if He would have aces, i Block so much hands that would beat me like AK, i dont Block Aces, but the
odds that hes get Aces are only 270 to 1, even if He would have Aces, i would nevertheless have 20%
equity to win it, so much hand habent even that, even if i would foldet Pocket Kings and i see that he haves AA it would be a hero fold, but if i would do that in long run, i lose money, because i fold the second best hand!
Conclusion: If you fold KK, you will WILL lose money, because your Hand doesnt pay the money it have to, because it lose all the equity if you fold!!!