Boy, of Troy, that is a toughie. Generally, and in most companies, the top brass pretty much do as they please, whether they invented the rules or not.

A great quote Father Steve brought to our board one day...

Is this a trench in which I am prepared to die?

This is something you have to decide. If it is, close the door to the office, sit and discuss it calmly. They may listen and agree, or just say "the rules don't apply to me" or, some such thing. If it is about something serious, you'll have to decide if you are willing to put up with it or not.