Is his acting like your boss hindering your work? Does he come between you and tasks to be done or somehow take credit for your work, at the same time diminishi

Is his acting like your boss hindering your work? Does he come between you and tasks to be done or somehow take credit for your work, at the same time diminishing you or reporting your work as bad when it is not? If it is only the kind of hierarchical conflict that rise in day to day conversation and doesn't actually interfere with work, you should give it little attention. Stand your ground with arguments and reason, and if some fails that means he was right in the first place to criticise and you can use the opportunity to be a better professional. But if he is actively hindering you unfairly you have to do something about it smartly. Can't really advise as to what specifically, but talking to other people, finding other coworkers with the same problem is a good start. And also maintaining good relations with his superiors is a nice idea too. Because if this is the case it is likely he is doing this to other people or other coworkers will notice this unfair relation. In any case, harsh positions are good opportunities to be a better professional and grow in social skills, if you so choose to see this as an opportunity for self improvement.