How does one rein in old white men?

I keep encountering old white men in positions of power with few to no checks on their professional behavior who have turned into raging narcissists. For instance, the Dean of the school I teach in was just unbelievably rude to one of my students, and I am very tempted to go to his office and tell him as much.

Then again, this would accomplish exactly nothing since my personal outrage has absolutely no bearing on his life.

Are we peons supposed to just take it? What the fuck is wrong with these people, anyway?