Readless this is indeed to nitty. The times, you can fold KK preflop, is, if you have a solid HUD-sample, and the player going all in is clearly a huge nit. Someone how have only 3-bet like 1-2% over tousinds of hands. Or it could be a situation, where the action is in early position at a full ring table. Like you open UTG, UTG+1 3-bets, and now UTG+2 cold 4-bets. Then folding can be ok, unless UTG+2 is a known LAG or maniac.
But when the open comes from BTN, you are going to be looking at a wider range here, because your 4-bet is not representing that much strenght. BTN is supposed to be stealing wide, and SB is supposed to be restealing wide as well, which mean you can also repop it light with a 4-bet. So I would totally expect an unknown villain to always be getting it in here with at least AK and QQ. And then you can simply not fold KK. If he has the aces this time, just sucks to be you.
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