It's not that there are different contexts, it's that with particular identity groups, the "rules" for that context vary so much over time (and context) as well

It's not that there are different contexts, it's that with particular identity groups, the "rules" for that context vary so much over time (and context) as well. For most of the 90's saying black was "wrong" in favor of African American. Now we've gone full circle, and the same people who made a sour-face at black 25 years ago are capitalizing it. That's probably the most benign, easy case. Of course ML can't keep up with loaded-terms and slurs; most people can hardly keep track of it all.