Ive lived in Chicago my whole life. Anti social behavior is not common, but it's definitely not rare. On public transit it is pretty standard. I think the lack of enforcement is what really rubs people the wrong way though. Not like someone being loud in public or whatever is that big of a deal, but it can create a mentality that quickly turns into a low trust society. When people dont respect your wishes why should you respect theirs kind of thinking. Most of chicago is absolutely a low trust society. Everyone acknowledges that rules arent enforced and are therefore optional. Low trust society + optional rules is an environment that many do not enjoy. The exclusionary zoning is just a reaction to that. When these people think of streets that are "alive" they remember that time they almost stepped in human shit in the park and they feel helpless. That feeling of helplessness easily overwhelms all the great times they had. Maybe theyre wrong to feel that way, maybe not.