Not something I'm familiar with outside of US TV. We ued to have the same thing about Council Estates over here. Middle-class homeowners being terrified of going into sprawling areas of rented housing occupied by low-income famillies. It was true that certain estates in certain cities did develop a certain reputation. Whether it was because Councils decided to put all the troublesome tenants in the same place, or whether like-minded folk gravitated toward one another, I don't know, but some estates were notorious. You didn't go there unless you needed to. To park your car was to come back and find it up on blocks and the wheels gone. There was one pub here in Coventry, on a Council Estate, where local legend had it that they checked you on the door for knives and if you didn't have one, they lent you one!

Race didn't seem to be a factor, unless you want to make anything of the fact that the majority of residents in the estates were white. There were and are areas in some British cities where the majority of residents are from India, or Pakistan. You can always tell because the shops spill out onto the street, especially the grocers and greengrocers, with large displays of stock taking up half the pavement.

That said, these groups still have a strong extended family tradition, and don't encourage their children to move away, or send the elderly into assisted living or care homes. They buy or rent homes from each other or local landlords.

As a white person walking down these streets, you might get the odd funny look, and not all the assistants in the shops might be fully fluent in English, but outright hostility is rare.