He might play a FD like this but he also has tons of 8x in his range.

I'm leaning towards folding, although I'm sure many will argue we should call and make a note. The fact he tried to barrel you twice already makes it less likely he will keep on doing it if you called him down.

This looks like a hand like 89 / 78 .... When people pot in these spots they tend to have it. Is he bluffing here 33%+? (you are getting 2:1) I dont know that he is. If he is aggro spew call but having him barrel you twice doesn't mean a lot if there was no showdown. He can be thinking that you are betting twice with nothing and now he wants to lead out with busted diamonds to make you fold. Pot doesnt seem to fit here really though people I think would be betting smaller here with air, it also depends how in line big bets are with his value range. Also, if he is aggro spewy, he would not be check calling flushdraws... if he was trying to make you fold he would likely be trying before the river. This leads me to think he has stationed 78 / 89.

Without solid reads he can be bluffing here fold and be happy you have position on someone like this.

In my opinion and experience, these are tough spots and he can have quite a few stronger hands. He might be a maniac but they've got me a lot of times like this. Usually they'll show a stronger hand, I like your line from the flop though but I'd make a nitty fold.

Also another note. You don't have to open ATo here, but it's certainly not bad. If you find you have aggro players behind then maybe lean towards a fold pre. Nice playable suited hands and good pair vs these guys are nice when they're in the blinds. ATo is a bit less great but not what I'd call bad.