i 100% agree with what most others say...folding kk pre flop without a REAL good read on the player (not the bet pattern) is uber weak at low-stakes. this is another example of "negative variance" which should be overly compensated for after enough hands.

kk is the second-nuts pre flop, and at low stakes like 5-25nl, i have seen (over 80k hands) many situations like this involving hands besides aa: maniacs with jqs, 33, 67s; or tt-qq lovers, ak pushers etc. this bet-pattern logic seems to imply routinely folding k high flushes or middle sets when facing a 4-bet all in from an unknown.