In the example given, I've found that pointing it out usually just leads to annoying the other, or giving more opening for spewing of the mouth. Some will even go so far as to do something stupid in defiance.
Bc - the wife in that case is being condenscending imo - trying to 'teach' .
A straight out 'stop screaming like a maniac, please. you're making me nervous' would be a little better route to go, i think.
He won't give a **** about the other driver, but he might give a **** about your feelings/comfort (i hope if he is your partner! lol).
I don't see the point of pointing out those things to a partner, and expecting any sort of change. You're basically doing it for your own sake. Any/most apologies or change of behavior after it being 'pointed out' are just to keep some peace, or get the other to shut up, or very temporary.
Seeing your partner getting hurt in some way by your actions, especially visibly, that can inspire some new levels of empathy if you love the person very much.
That silent 'taking it' can really scorch through the toughie layers at times.
Myself having moments and traits where my empathy could be much better, I feel like any negativity or 'calling' of the insensitivity is prone to activate defensive mechanisms easily. The 'i am being criticized and rejected' buttons can be touchy on those issues. Straight appeals to what i care about works better...
it's not necessarily brutishness, but sometimes it is.
total opinion.