His full house beat your 4 of a kind?

Reguardles of what you were trying to say with your example, you should ALMOST ALWAYS raise 3-5xbb preflop with AA or KK. The only good reason to not do so is to change up your table image a little bit.

The things to keep in mind are that:

-AA is nice, but it is still just a pair - how many showdowns do you see where someone has better than just a pair?

-AA loses its value when you have more than one other person in the hand with you. You will still be ahead preflop but you are not dominating as much as you are in a heads up situation.

- Typically with AA you will either win a small amount of money or lose a large amount of money. Its a hard hand to fold when you should.