The boss said that my brain was not bright.

What your leader said is not true, or he really wants you to improve, so he says it in the way he thinks is right, in order to promote your growth. Einstein said that if you want to solve a problem, you have to think at a higher latitude. If you only look at what you say and do, and don't look at motivation, problems will emerge one after another. All the boss says and does is fruit. What is the reason? What's his purpose? Only by seeing these clearly can we cooperate intelligently.