1. Students and teachers are not always good role models and schools are not always a good environment for learning soft skills. Some schools are quite toxic. I'm sure many here can relate.
2. Who better to teach you social cues than your parents who love you and will be patient with you?
3. It depends on the child and the parents. Our oldest daughter is extremely introverted and was homeschooled yet has better social graces than her mother and I combined. Our middle daughter (extrovert) has a strong network of online/offline friends through various programs and activities. She will be starting a private school in the fall.
4. Homeschooled children get used to interacting with adults who are not in a school environment and tend to communicate in an adult like manner (IMHE).
5. The successful homeschoolers tend not to advertise it, yet they are everywhere. Unsuccessful home schoolers often become the subject click bait articles or books (ala Tara Westover's experience).
School for me was a horrible experience socially for me. I wish I'd been home schooled.