There is nothing worse when a subordinate deliberately brings up CRM encouraged assertiveness as an excuse for deplorable bad manners on the flight deck or at flight planning stage.
Actually, there are lots of things worse. I do not think you guys get it. CRM is not something designed to take away your godlike powers as Captain. It is some knowledge of human interaction and a set of tools to turn 2 pilots into a crew. Obviously in the above example the Captain failed to manage the crew properly. It is also implied that due to a real or perceived lack of management support, the Captain also failed to address the problem with the F/O later. This means that the problem isn't with one stroppy F/O (rediculous concept), it is systemic to the organization and will continue.
Stroppyness, or any other character flaw, is a problem no matter which seat you are in. Anyone who thinks otherwise doesn't belong in either one.