You don’t need to go into their neighborhoods to get that feeling. Standing next to a black person in a checkout line and you get that same feeling regardless the neighborhood.
In our country’s recent history we’ve celebrated diversity in our population as if it were a good thing, but one look at world history will show you that no country with a diverse population of different races, languages, and religion has long survived.
Countries don’t naturally form with a diverse population and when in the past they’ve occurred it’s usually been as a result of armed conquest. These unnaturally formed countries have either melded together into a single population made up of one mixed race with one language and one religion or they’ve come apart, and they’ve usually come apart with extreme violence. The longer these diverse populations are forced to coexist with one another without mixing and becoming one, the more the hatred grows among them and the more violently they break apart, but break apart they will, or genocide will settle the issue once and for all.