Realistic?

Depends. He raises some interesting points in his rage. You must decide if you go by the law or moral codes. Since Arnott is always lawful, he has always shown bad moral judgement with women. But that is hardly of relevance for the high ranking officer, since it is his private life. But he could get a warning i guess for acting offensive. ;)

"The end is not the end, but for the beginning an end is always near."

I can see that happening. What I have a problem with is the physical assaults not being reported or if it is, no disciplinary action taken.
Nigel hitting Kate with his cane on work premises and Lindsey assaulting Kate on a work assignment outside of work premises.
Kate just keeps rolling with the punches, she's definitely the strongest of the bunch.

I suppose in the police tensions can get high. They are used to being spoken to in a bad manor by criminals. It's also a highly stressful job. And I suppose it's so hard to find AC detectives that once you find one you take them as they come. Better to be honest and vocal than dishonest and not,

ΔΨΨΔ

I've noticed all the spitting, toilet swirled and physical assault don't result in any disciplinary action.