Happens all the time.
No worries.
I read the article you linked. This stood out. "
White teachers,
with lower expectations of black children, rated the severity of the behavior lower. Black teachers,
who held black students to a higher standard, consistently rated their behavior as more severe."
How are those statements not also micro-aggression's? I don't know, none of this sits well.
No matter where anyone sets the bar they are ridiculed and projected upon as to their reasoning.