Good fold in hindsight, but not as obvious as you make out imo, if the bigger stacked tight guy is a good player he'll see that the idiots been throwing his chips around and may very well make a big 3 bet with anything from TT-AA,AJ-AK, which in his eyes is plenty to get HU with the donk with. Your equity against this range with QQ is 58%, would you have called with AKs??
I know the hand history isn't up there but i get the feeling you murdered the 4's hand from start to finish lol I don't think it was a great call on the river tbh, he puts in a pot size shove on the river which is exactly what you want to be doing when you have the ace or king here b/c it gives good odds
to villains that have usually put in a large portion of their stack, it ensures that people with lower flushes......... get their money in and you take it down, what really shoves here that you beat??? He's either beating you, which is the outcome with the greatest possibility, or he's got air, very rarely imo. You made the call and got lucky that you caught him the 10% of the time that he's bluffing here i think.
NEVER slow play at 2-10nl imo if you do your usually missing out on a full three streets of value against most opponents who will pay you off light as shit!