any of you guys ever have brainlet professors? That is, professors who strictly grade based on what the solution manual says, don't read written explanations, or mark a problem wrong when you don't use the method they want you to use (unless it strictly states in the problem to use a certain method)?

Seriously, how can you have a doctorate in Mathematics and rely on a fucking solutions manual for an undergraduate course and treat is as if it's the end all say all?