To understand much of our language, Gnorts would have to already be aware that our words and symbols gain meaning from how they're used, and you couldn't, for instance, determine that a swastika is offensive (in the west) by its shape alone.
In this case, the term "colored people" gained racist connotations from its history of being used for discrimination and segregation - and avoiding it for that reason is the primary principle at play. There's also the secondary/less universal principle of preferring "person-first language".
they’re not colored, they’re African-American
they’re not African-American, they’re black
they’re not black, they’re Black
they’re not Black, they’re People of Color
they’re not People of Color, they’re BIPOC
I wonder what the next twist of the pretzel will look like
I know it sucks to keep up with things, but what sucks even works is not keeping up, and finding you and the neo nazis using the same language to mean different things. If you care, then you put the work in. That’s all anyone can do.