I am not adding much more here, but I agree that Ace rag from any position is usually a fold from me. Having said that, when blinds are large, and you are in late position with a short stack, an Ace can be a powerful card. In a limped pot in late position with Ace rag, there is nothing wrong with a 3-bet or a shove if you are short-stacked. If it is a raised pot, unless you are in the "Danger Zone", where a shove/fold is your only option, nothing wrong with the fold. I look at it from the perspective that if you hit the flop, you either have Aces with a weak kicker, or rag pair with a big kicker. Neither of those are particularly fun.
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