We did the Following to Drop BIL by One Level.
This person had problems with his brother-in-law, but some people have problems with their spouse’s parents. He called himself annoying, so it seems like he wasn’t the only one who thought he was annoying. Because of this, she thought it was important to try to calm him down was important. There doesn’t seem to be anything to learn from the story.

People tend to look down on people who brag about themselves as a matter of course. In terms of how it looks, the final product is a disaster. Even if you have a lot of good things about you, you don’t have to brag about them all the time. When you are socializing with your wife’s family, it is polite to keep a low profile and act respectfully.