If I have KK and the flop has one or two aces, that's a decision. If they push, do I fold every time?
Yes.

Every time.

Unless you have a SUPER strong read (and i've never had one that strong)

If they are so sure they have the best hand after my PFR and a Axx flop, I believe them.

ps: thats also why my PFR/Continuation bets/Value bets are almost always the exact same size so that they dont know from my pattern if I have KK or AK or AA or TT or 76s