I absolutely would interfere in cases or a child being abused or elderly or someone in a limited mental capacity.

Bottom line if a people can’t stand up for themselves because of power imbalance or limited capacity then it’s an honorable idea to interfere.

If however able bodied adults want to fight ad argue or talk nasty to each other, then who am I to say what’s right or wrong. Some people might have that kind of unhealthy dynamics, that’s how they roll. If I am uncomfortable, I’d remove myself.

Of course if someone is in danger, I’d call the police