Seems like everyone has such a story about a teacher. „No you can’t read more advanced books because the current ones bore you“ etc etc
What is the matter with these people.
It's typical. They're supposed have authority and be better than you. That is the purpose of their position and their identity.
Don't be so quick to judge, because most people, including you would react the same way in similar contexts, for example if you were the top engineer at a company and someone started showing you up and being a hundred times better than you.
rigidity