Need to check the HR policy on whistleblow. If you have witnesses better to go in a strung of straws than a single person's effort to report.

But on other hand if RO request work to be done, then most likely can't find fault with him. If his attitude is not showing respect to his subordinates. If escalated, I think he may get a talk from his boss. Don't think will get him into a big trouble.

Alternatively, if you all have "comrades spirit", maybe a mass activation of the termination trigger button will sure scare the sh*t off this RO pants.