That is the answer! I already had this problem too. You can learn a lot, even if the mentor is awful. You will be challenged a lot to put your point of view in

That is the answer! I already had this problem too. You can learn a lot, even if the mentor is awful. You will be challenged a lot to put your point of view in the code, maybe you even discover you are wrong about your arguments. If you really think you can't learn anything from him, probably he is the right person, you have a lot to learn.