Of course AA can be beaten, so can KK, it's an Ace magnet, just kidding.
It's how you play them, if like me you play them like an idiot then you deserve to get beaten, I don't do that all the time, but it can happen.
AA doesn't win all the time, it just does a lot. 72o doesn't always lose, just does a lot, they can and sometimes will crack AA.
63 is my nemesis, cracking my aces. Both to different players one off suited, one suited, and as both players seemed capped, I've never expected 2P on both flops, booooo