Adjusting To Semi-Thinking Maniacs

[gaming_mouse]

This guy is 41/20 but has been doing insane things to other people like cap semi bluffing turns and other wacky bluffs. but he is not totally lacking thought. he's been trying to steal my BB alot too.

He opens (this is around 50% of his hands), SB folds, I think about 3betting but call (should i have 3bet?).

The flop comes Axx.

What is my plan. He could bluff all the way here with anything. He could also raise a flop bet and bluff all the way after that. Etc.

What is my plan? Calling down doesnt seem right.