I had a Silent Seether in one of my classes last semester. That's my name for someone who hates your class--and probably you--and you don't know it until course evaluations.
This Seether gave the course below average marks in everything--including my command of spoken English. That's how I know they were really unhappy. I'm a native English speaker.
What bothers me--even scares me--about Seethers is you have idea they're there. For example, I know when a course has gone off the rails. I've been teaching 13 years. In that case, I expect lower evals. Or when I get into it with a student and she and I clash all semester despite my best efforts. Or a student is reprimanded for acting out. Or I won't accept their late work. Or they get a grade they don't think they deserve.
But the Silent Seether.
They smile. They laugh at everyone's jokes. They take notes. They turn in their work on time. They could be making an A or a B. And all along, inside their guts or hearts, hate is boiling.
There's nothing I can do about the Seether unless they let me know their pain. Then, perhaps, maybe, we can address it and reach an understanding. Until then, I'm sorry you hate me and the class, Silent Seether. And, please, be careful! I worry about your health.