Never speak ill of someone you work for. No matter what may have happened, publicly, you always need to have your boss’ back. Privately, you will hopefully have an opportunity to speak honestly and share your thoughts, ideas and comments. Conversely, don’t allow anyone to badmouth you or your team especially if they haven’t approached you first or have nothing to substantiate those claims. Be accountable, respectable and professional and expect the same from others as that’s only fair.