That one time I reported immediately, for behaviour I considered well outside professional conduct. I made no further mention of it. He, however, didn't even acknowledge me for over six months. Which is odd, considering that by the codes of military service, (when he strongly self identifies as Marine) no matter your personal feelings, you salute and greet anyone crossing your path. I'd give him a "good morning" and he would pretend I didn't exist. I found this very funny and childish, but never pushed further.
Not a whole person we were dealing with there. Divorced from himself.