I always wonder why a woman would marry a guy like this in the first place. I wish people of both sex would understand that they will not change their spouse just because he/she becomes a spouse. The way I see it, by marrying him as he was she gave him permission to behave in this way.
If the bad manners have progessed over time she should have stopped being seen in public with him when it started and insisted he locate his lost manners.
Letting your hair down in your own home is one thing but acting like "a barnyard animal" is another.