What is racist, and what is not?
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We could also ask, what is racist, and what is personal preference.
For instance, all through school, I saw people self-segregate. In the groups they hung out with, at parties (usually not mixed at all), and very visibly, in the cafeterias. Nothing was ever thought about it, one way or another.
I played in musical groups for years. Most band members were black, next were hispanics, few were white. I did most of the hiring. We traveled a bit, played colleges, clubs, and after hour joints.
We played jazz, blues, funk, rock, and anything else we wanted to play. We had some good musicians and they loved what they were doing.
And we played for audiences of all kinds, preferring mixed crowds, as they were the hippest and most fun. Our last group was together for a few years and would draw "standing room only" crowds.
And, even in these settings - where the guys became close and spent tons of time together - people would usually self-segregate. This included band members during most breaks, and audience members, even when the crowds were mixed, racially.
I've seen this behavior for many decades, even though many of the people became close friends.
Racism and "preference" can easily be mistaken and misunderstood. The subject can be mind boggling in its complexity.
And anyone who doesn't agree, is a freaking wacist.