Nobody's trying to make anybody do anything, they're making a map of racial distributions. If you see that is a threat, it's because you think that some of the beliefs that you have would be seen as racist - and you're projecting onto the makers of a map.

I use white friends to make apartment inquiries for me in neighborhoods known for housing discrimination, do I exist?

150 years ago, white people were far more likely to know and live near black people. Did nature somehow change in the interim?

Separate but equal was a set of laws imposing a behavior from above. The equal part wasn't true, and it wasn't 100 years ago. It was the environment that my parents grew up in, and I went to a segregated school myself. It wasn't anything that black people had or have any choice over, or preferred.