Nah, you’re definitely not overreacting. That’s physical harassment, plain and simple. If this guy is doing stuff like shoving and tripping, it’s already a problem that needs to be dealt with, you know? Ignoring it might just make him think it’s okay to keep going. Tbh, I’d talk to a teacher or counselor—it might feel scary, but they’re supposed to help with this stuff. You don’t deserve to be treated like that.