Why does everyone insist you can't fold Kings preflop?

[Bralynn]

I've heard it from every place I can think of. Forums, books, players, etc.

I just don't agree with it!

There are times when I'm at least 90% sure I'm against Aces preflop.

Situation such as:

-Playing at a 6 handed $100 NL table, cash game.
-Have played against my opponent for a couple hours and he is extremely tight.
-Has only shown high quality hands. We both have more than $100, such as $300-400.
-He is behind me in position. I raise, he reraises, I reraise, he goes all-in.

I've seen this situation many many times, and way more often than not, I'm correct. The other times, this player randomly decided to make a poor play like this with AKs or QQ, but it is by far more likely from my experience this player has AA.

I just think there are times when it's worth it to fold KK, yet I constantly hear from everywhere how you just can't do it.