What Sarbox said +2.

Here's the deal with 3betting preflop and NOT min-raising the flop. Pot odds. On the flop, when Hero is to act, there's basically $3 in the pot. You raised another $1.30. So villain has to call $1.30 to have a chance at winning $4.30. He's getting better than 3 to 1 pots odds, so he only needs 25% equity here to call. It's hard to be that far ahead (and know it) in this spot. Holding any 8, 6, TT, 44, or a spade (he can't KNOW you have the As), villain is correct to call here because he's likely to improve enough on the next card. Villain is also likely to have a sc with 8+ outs or small pp that made him a set. Which brings us to preflop pot odds.

Even though AA is big preflop favorite (min of 60-40 chance of winning an all-in confrontation), against a wide range of opening hands from a loose villain it's not very often better than a 75-25 favorite. But 3betting is perfect here 'cuz 3bets tend to get flatted (just called, not raise) most the time with med pp's (QQ - 88), AQ+, A9s+, KQs and sc's. These are the perfect hands for villain to have when we hold AA since all the pp's and Ax hands are HUGE dogs to our bullets.

What size should a preflop rr (3bet) be? At least 3x villain's raise (in position), and 3.5x - 4x villain's raise (out of position). This get's villain calling WITHOUT proper pot odds for the equity he has.

Also, what happens when you get 4bet? Hopefully it's all-in and you snap call. If , you should rr all-in. The amazing crap that 10nl villains will call all-in's with is amazing: AJs, 55. And if they fold, we've got at least a third of their stack already in the middle. NH, hero.