You need a high GPA to get into a good university, and challenging a liberal teacher on something as sacred to them as "white privilege" is a fast track to community college.
Let him go teach in some crappy inner city school, where he can pay penance for his white sin.
About 25 years ago, one of my family members was enrolled in master’s in education program at a large university in California. I can’t remember all of the details, but the professor assigned some essay topic involving his left-wing views. My family member turned in an essay challenging the professor’s views in a well-written, reasonable way... and promptly received an F. She was told that a do-over was possible. So my family member rewrote the essay reversing opinion on nearly every point. The rewritten essay received an “A-” and a handwritten comment along the lines, “Glad to see that you get it now.”