That was one of my favorite parts of Sandbanks Provincial Campground ~ we loved the "quiet/radio free" areas. We also just really enjoyed the whole campground but that made it even better!Sometimes. It's also often a thing at provincial parks in the "quiet/radio free" loops - nobody cares if you drink, but if you cause trouble, the booze gets you kicked out without them needing to prove anything subjective
The one that consistently gets me is the loud music and lights from neighbouring sites while I'm trying to enjoy a campfire and pretending to be miles from anyone. Occasional car doors, or a kid talking loudly (calling from their camper usually) is normal, but I don't want to hear anyone else for an extended period of time.
I always look for the radio free loops, but the loop just on the other side of a thin strip of trees may not be. And often there are no rangers and no enforcement around so it can go on all night.