My point is that math professors as a bunch put up with this kind of stuff all the time because more than half of the incoming class is just going to be horribly unprepared for any kind of graduate work. Are the students to blame for being unprepared? Yes, I think so but there is also the fact that universities take on way too many graduate students simply because somebody has to be a TA for all the lower division classes the math department offers. This is just bureaucratic bloat and a byproduct of this bureaucratic bloat is that people who shouldn't get a PhD get pushed through the system because it keeps the attrition rate down, at least on paper. So it's great that this guy is standing up for what he believes in but the problem is more systemic and I doubt his one man stand against one student is going to make much difference to how the universities currently operate.