I haven't ever homeschooled myself, but I've had quite a few homeschooled children take part in groups I've led, and my experience has been the opposite - the homeschooled children that I've had have instead often been quite adept at understanding acceptable social behavior and are able to navigate social nuances as well as the other-schooled kids
A school can worsen manners (I'm not sure what "social skills" means) if it tolerates misbehavior by students. I went to a good suburban high school. I remember once going to a lower-track English class to take a test for another class with the same teacher. I was surprised by the chaotic environment. The boys in the back of the class loudly carried on their own conversations, which the teacher must have noticed but ignored. This never happened in honors classes. In urban schools the behavior tolerated can be much worse.
If you disrespect your boss at a meeting in this way, expect to be fired. These boys were being DE-socialized.
I went to an excellent suburban high school. The smart affluent kids in the AP classes (some of them anyway) were rude and obnoxious to the teachers. This is not an issue relegated to race or class or intelligence. And, sadly, connections can get kids out of a whole lot of disrespectful behavior. Google the recent incident at Piedmont Driving Club, one of the most prestigious clubs in Atlanta, for examples of terrible behavior by those who have not been fired from their jobs, were probably obnoxious in high school, college, and the workplace, and have continued to not suffer the consequences of their behavior.
