If the board was 6AA96 and you bet the river and villain raised as played, would you have a tough time folding?

A random villain playing 63/0 probably has 8x in their range just as likely as Ax or only somewhat less likely than Ax. If villain was like 10/0 I'd be more inclined to call cause they have less 8x, and for all we know they could be playing a hand like AA/KK really stupidly.