I grew up in a segregated style, not just by pigment ( there ya go! ... A PC neutral term )and religion; ethnic stance, and in school, by family / sibling / names.
i.e. ... Italians lived in Italian sections ( as I did ) , and Polish, Irish etc. in their own.
Churches....the same way. Catholic as I supposedly was, had been separated by ethnic background. i.e. St. Anthony's was Italian; and you went there if you were Italian. St. Vincents, was the Irish church. St Josephs was the Lithuanian church.
I was not allowed to play with kids, and even one relative / cousin, with the same surname, because they were Protestant, or Episcopal etc. etc. etc. .... Can you believe that??
As a kid, the priest and the nuns warned us, and told us not to associate with them. they said that they will not Go To Heaven.
We were NOT ALLOWED to have a friend, if the parent was divorced or separated.
I grew up in times of Polio. There was Polio Season, and would you believe, if a kid had polio affliction, even a slight limp or twisted limb, we were NOT allowed to associate with that kid.
I grew up when Women would never smoke in public; even in their own yard to be seen, or they would automatically be labeled a "W" or "S" .... Bad Bad way to try and grow up.
And all that was the norm. ( pun not intended ) ... The schools I went to were separated by big cement / concrete signs ( BOYS ) and ( GIRLS ) entrance sides.
We were chased, shot at with bb guns by adult home owners, and kicked and slapped by any adult that felt we looked bad or did something they didn't approve of ( like jumping over their fence, or cutting through their yard.
And... We all lived...there were no complaints, and no one was offended. It was the way it was.