Looks like the the demographics at the Galveston campus (a small campus of almost two and half thousand students--UW-Milwaukee campus has around 30,000 students, and Milwaukee Area Technical College has around 50,000 students as a community college) are that of a mostly white, male student body.
I'm going to make a guess the particular course in discussion was that of a predominately white, male class. If it's a tough course with lots of tough math problems, and most importantly a course within a state run university system, then odds are the black, male student count is very slight if at all present.
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I appreciate all the professors, teachers, and TA's I've ever had (even the TA I never saw that gave me an F on a philosophy paper I was confident I was going to get at least a B in

). But there was
one female professor at community college that was quite a character in the negative sense. She was sociology professor. Competent in her knowledge of sociology I must admit but boy could this woman get going on her pet issues. Preaching we must support abortion etc. Half the class period she would spend bragging about her academic and financial accomplishments. Her expensive new SUV and so forth.
I'm lucky I switched to a different class with a different instructor. I got an A in the class with the new instructor but would have gotten an F I'm certain with that other professor because she did not like me personally. I made the mistake of disagreeing with her on some points--one about US military people (whom she viewed as rather stupid). And I let her know I was military veteran.
So, there is probably two sides to this story with this professor and the class he is failing. He could be 100% right, 50% right, 20% right or possibly 0% right. I don't know.
At community college I was in algebra class in which the female professor required the every student in the class to work out one problem on the board every class. I dreaded each class as I'm
slow and poor in math. With emphasis on slow (after taking IQ tests for several days at Marquette University, I later found out I'm below average in the speed at which my brain processes information, this would explain why even when I got A's on exams I was typically the last student of of the class room). And to make matters worse there were a couple young black guys in the back of the room that would always make noises and fun of me when I was struggling at the chalk board. So, it was a bit embarrassing and nerve wracking for me. And I can see how
some (but by no means most) young college students can be a bit of pains and juvenile in a class room.
But at the university level I can't imagine the behavior reported in the article is wide spread. If the claims are true I would suspect these are rare occurrences. Except for the cheating part.