Been dealing about 10 yr now. This type of thing is a judgement call and case to case, but I did learn thru the years a basic 'dealing code' if you would...
The golden rule: KEEP THE GAME MOVING.
When a game stops, sucks for everybody...the players, the dealers, the house, everybody. Understanding that, sometimes things happen.
Had a situation around year 2 or 3 of dealing where a lady and husband were fairly drunk and belligerent and seriously verbally abusing a canadian player who was getting lucky. Cursing, mean, terrible comments.
I decided to "fix the world" and yell at her and her husband to stop, then they didn't and I called the floor. The floor pretty much said "let's just play poker" and walked away...in other words, floor isn't going to do anything. So... The canadian player I defended didn't say a word of encouragement or thanks. Nothing. The lady and husband i yelled at were locals and tipped very nicely...but not to me that night or a few meetings later until we talked about it and cleared the air.
Not to digress, back to the incident, she goes on an insane run of cards and not only do I not get tipped, but the Canadian gives no thanks either. I learned a valuable lesson that day... Don't be a hero. Don't be a 'fix all things', 'nose in all things' dealer.
That's just one incident. But it's best for a dealer to remain as neutral as possible, getting involved only when absolutely necessary, and keeping the game moving.
Now, to heck with it. Unless A...they are slowing down the game, B...getting violent, or C... someone asks that I get involved and if A or B isn't present, I call the floor and don't get involved...they can verbally spar all they want, I'm not a psychiatrist, I'm a poker dealer. I don't get involved unless one of those three things happen.
The key thing I always ask myself is, is it grossly negatively affecting the game to the point that action is slowing down or stopping? If the answer is yes, I'll take some kind of action. If not, then it's pitch and grind.
yap