The previous 5 years, I've spent a month or so hosting at an NFS campground, and the last 60 years or so camping from time to time. As long as I can remember, there have been occasional encounters with narcissistic campers who disturbed others. I have not particularly noticed much increase in their numbers. But I also haven't been camping yet this season, partly because it has been raining a lot here, and the field through which I have to drag the TT to turn around before I can leave home with it has been too soft to attempt.
But I would not be surprised given the current state of affairs to find the loud party crowd more frequently camping out. People are being encouraged to take their mass assemblages outdoors.
Those I have encountered over the years ranged from the family that may have all been particularly hard of hearing, in the sense of not realizing how loud they were. I remember being awakened early one Saturday morning by the two kids INSIDE their own TT, carefully whispering back and forth so as to not wake anybody, parents in particular. Thing is, they didn't realize that their breathy whispers were around 80 dB.
There was also the group of college kids around a campfire just before midnight, who, though respectful of my hostly request to keep it down, clearly did not understand that voices carry a long way in the otherwise silent woods. In their defense, they did remind one another to tone it down from time to time after I made my request. They were trying.
Only once have I encountered folks who were aggressively entitled and in-your-face. They were both drunk and delusional, having decided both that we were an Amish extended family (because one of us had a beard) and that we had 35 children (3, by my count) on site. That was a long weekend, btw, as the private campground management lacked the balls to toss them out. The pile of beer cans they accumulated was impressive.