After all, to do research with a professor, a student has to have good social skills. So why not have classes that teach social etiquette and social skills? It seems that many courses in college are "book courses." Yet, when students graduate, what really matters is how they present themselves and their social skills.
At our university (the Netherlands) students are actively involved in group projects and as a part of the preparation to these projects they get some training on how to give talks, how to negotiate, how to organize/chair meetings, etc.