"there are some homeschooling parents who choose to shelter their children from interacting with the world-at-large, whose goal is to narrow rather than broaden their children’s perspective, but that’s not the kind of home/unschooling we’re discussing here." (emphasis mine)
What an absolutely perfect way to put it. People whose goal it is to narrow rather than broaden their children's perspective.
Problem solved. Now I know how to put things next time I'm trying to clarify the type of home-education I do support, versus those other not-good types!