Can confirm, had a nutball bipolar sergeant. On his bad days, he wanted to fight me and then try to bust me down for "disrespect of a superior non-commissioned officer." On his good days, he would whine about how no one respected him or liked him.

I got meritoriously promoted solely to get away from him. The master sergeant congratulated him for "mentoring" me to be such a good Marine. Motherfucker.

Thankfully, he's now EAS'd and in Alaska with the bears, where he belongs.