I'm kidding, but... you want school to build your kids' social skills? Apart from all the pathologies common in schools, you want your kids to grow up to live in an adult world, which is almost completely unlike school.
Yeah, homeschooling can be done where the kids are isolated and never interact with anyone outside the family. It doesn't have to be, though.
I mean... yes, it seems reasonable to learn social skills from a school setting? Interacting with other people, some of whom dislike/disagree with each other, interacting with other adults, etc. This seems like a reasonable step toward what you describe as 'the adult world' - which, yes, is rather different from school, but that seems a good thing; throwing a child into 'the adult world' without preparation would be crazy, right?
(I'm not trying to deny that one can learn the necessary social skills while being homeschooled, just disagree with the implication that school is not also a good place to develop them)
I wonder if this person's view on schools is at all biased.
For what it's worth, I look back on my time in school with relative fondness. Certainly I don't agree with anything like it 'being a cage' or feeling isolated from other people (????)