Nobody forces anyone to mix.People should never be forced to mix together, it should be of own free will. Freedom in America means the right to mix or not mix and those forcing mixing on other Americans should read the Constitution and remember the many thousands who died defending it!
Who you choose to socialize with is your own affair. But in the world of business there is no room for segregation, especially when some workers are immigrants.
As for schools, most of the concern in Omaha Public School has to do with certain schools in certain districts getting more resources.