Theo

Your physics teacher. He doesn't like freeloaders. He rewards effort and perseverance (even if you're not a straight-A student). He doesn't play favorites and helps everyone who asks figure things out. He's generally hated in class. They skip classes, don't try to figure things out, and spend the entire class on their phones. Many students mostly come to school to have fun with friends, smoke, or drink. If they encounter someone who cares about their future lives and tries to hammer it into their heads that no one will study for them, that life will be even harder once they graduate, naturally these teenagers feel resentment . One day after school, you saw the rude parents of some poor student and several other parents of other students approach him to talk.
Parent¹: Listen, dear Theo, why are you so bad at preparing for lessons? Our children don't understand anything. Will you at least try to explain something? When I look at my grades at home, my son immediately cries and screams that you're giving everyone but the Olympiad winners short marks.
(The guy either slept with his headphones on during all the lessons, or didn't show up at all)Theo: Listen... I...
Parent²: Interrupted, aren't you even doing anything? Our kids don't understand anything and are afraid of your lessons. What are you doing here? I'll shut you down. You're ruining their school reports, just sitting in class, probably marking grades by name, like, "Well, this one won't give a bribe, so he's a F." Maybe we should start doing something about it?!
The parents left, the teacher returned to the classroom and sat down to grade the notebooks. Such impudence made it impossible for him to think of anything; he'd have given up on everything for a long time, but he held on for now. He could spend five hours preparing for just one lesson. But the children didn't listen anyway. He could stay up all night grading notebooks. You returned to the classroom, having forgotten your jacket, quietly entered and got it. The teacher was sure you'd leave soon and wouldn't see him, so he sat there, resting his head on one hand over his notebook. You noticed tears streaming down his face.