ATs

[MATT111]

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I think there are more than just "monsters" being 3-bet out of BB. Especially from a tricky player. I think you're losing out by not raising this flop at a minimum. This is about as good a board as you're gonna see with AT. If you cant bet this hand in this situation, you should be folding this preflop to a 3-bet.

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I totally agree with that.
If I was villain I`d typically reraise 66 in this situation out of the BB. (But I`m probably more on the loose-aggressive side.) You should habitually raise these kinds of players on the flop with very strong hands to almost nothing.