I was in your situation just a few months ago, but I decided to take a break from learning and focus more on enjoying myself by playing what I want to play. It's going great. I learn new things by myself, but I admit it is hugely thanks to the teacher I had. Even if the lessons weren't that great, I still learned a lot of things and I can comfortably play most things I encounter. Sometimes you can learn things from casual conversation with a teacher that isn't strictly technique or sight reading, it could be a small tip or even a life lesson. If I had learned robotically every single rudiment and sight reading book, I wouldn't have the skills I have now, I wouldn't know how to properly hit a drum, I wouldn't have gotten advice to sit with good posture at the kit, to sum it up I would not be where I am now. Rudiments and learning from books isn't really everything, and you can really learn just as much from conversation and enjoying yourself while playing. But I agree, it can be boring and it can seem like a waste of money and time, but you might realize it's a valuable thing in the future. Or maybe he's just an asshat. Which in that case I'd change teacher or teach myself.