[CrushinFelt]

This isn't a snap-call for me at all, and I wouldn't consider myself a nit.

You can put 88 in their range, but I see most people pushing this flop with it because for them to raise preflop they would likely have straight blockers making them less afraid of uber wrap+FD hands. Also because if they did have 88 they probably shove because it's not something you would expect them to have a lot of the time.

They could have some sort of wrap + FD themselves and are using the Ace to semi-bluff at the pot knowing that they might have some fold equity to go along with their big draw.

With all that being said, this is still probably still a call because there might just be enough hands in their range to give you the odds you need to make this call (2.5-1).

It's a pretty sick spot and we are drawing to 1-out when we are wrong and are probably no more than 70/30 when we are right (Im' discounted 88 quite a bit here). I doubt I'd talk myself into a fold, but I don't think I'd overly criticize anyone for doing it.