There is definitely a lot of confirmation bias but I do try to mention that every time I do a NOT IN MY EXPERIENCE XD I have at least two narrow ranges (depending on the parameters for the ranges) with slight overlaps.

My area is in a very long, slow and painful process of gentrifying (had started/was in fairly early progress since we moved here a couple of decades ago which is good in some ways and bad in others) but is still generally "low socioeconomic" (if you hear a a loud booming noise somewhere it could be a tree falling over, could be a car crash, could be a gunshot, could be a meth lab blowing up, less frequently now along with the rolling domestics which have gone from every other night to once a month or so) and seeing the behaviours you're describing would be completely unsurprising/expected around here but thankfully it doesn't seem to be a thing that's happening outside of the local high schools (the brawls seem to happen either on school grounds or not too far outside). I'm pretending it's because of all the programs run by the local government and centres like ours and all the grassroots/community sports where we will continue our absolute damnedest to try to stop apples from going bad in spite of everything and everyone else. Including this cost of living squeeze which is probably the thing I'm actually most worried about as far as stressors contributing to this type of situation goes x_x