Derech HaMelech:
Following your logic, the more a menahel or rebbe is interested in the externals of his talmidim, the less he will be able to concentrate on the ruchniyus. There is nothing wrong with a dress code in a yeshiva, but all of these gashmiyus issues that are truly trivial have become priority over the mission of transmitting the values of Ahavas Hashem and Yiras Hashem to the younger generation. We’re in trouble until the nonsense stops.