The fact that some self-righteous jackass is verbally berating your self-centered woman over her sense of entitlement and disregard for traffic rules does not give you a pass to commit the crime of battery on said jackass. There is a reason that the law doesn't say "meet force with force".
"He deserved to get smacked" hasn't been a valid legal defense for quite some time. He who does the first smacking is the aggressor, plain and simple, barring any evidence that the loudmouth has verbally expressed a credible threat to do bodily harm.
From today's CNN article:
Gualtieri says there's no evidence that Drejka posed a threat to McGlockton's family, it was strictly a verbal argument, but McGlockton did engage in unlawful conduct when he pushed Drejka.
"Markeis wouldn't be dead if Markeis didn't slam this guy to the ground," Gualtieri said.
....and some rin up hill and down dale, knapping the chucky stanes to pieces wi' hammers, like sae mony road-makers run daft - they say it is to see how the warld was made!
Saint Ronan's Well - Sir Walter Scott, Bart. (1824)