If you cant EVER fold KK preflop then you will never be a good poker player. Some situations DEMAND you fold them... Same with AA if there are 4 or 5 people allin you are no where near favored. Easy fold really!! Was you playin tight in this game? cause he may have took you for a tight player and when u pushed back he could have easily put u on AA or any ace. Even tho any ace isnt favored LIVE its a huge fav online as the ace comes out on the board 8 of 10 times when u have KK