Having someones kids cut through my site, or the guy two trailers down run his contractor grade generator during generator hours - those are little things... if it's getting on my nerves, I go for a walk, or a drive, or just go inside and turn on the rooftop AC fan, which is SO LOUD I can't hear anything else.
I'll take the time to politely remind them about campground manners. Most kids apologize and don't do it again. If it's within the rules, such as the generator time you spoke of, I'll do the same-get away from it. I'm a very light sleeper but I take the onus on myself to deal with as much of the noise as possible-up to a certain point. If I decide to go to bed early, it's my issue. If it's after quiet hours then that might be a whole different discussion.