Broken window theory is real: imagine a random person in spotlessly clean city versus a city where there is trash everywhere. More people would litter in the latter city, I don’t think that is too controversial. Thus a run-down neighborhood with lots of broken windows will normalize behaviors that would be stigmatized elsewhere.
The unfortunate part was when NY adopted “broken windows policing”, which is to go into those neighborhoods and make lots of arrests for petty crimes, as if replacing all the broken windows might somehow reduce crime. Of course this is pretty dumb, since entrenched normalization of deviance (decades of bad/discriminatory policy) can’t simply be fixed by zealous application of punitive measures.