Private
That is a belief that seems to carry over to my old home. That those who have magical blood running through their veins are far more important than those who simply learned on their own, or those who know nothing at all.
There are non-magical people in my world, yes. Our two worlds are generally kept quite separately with the idea that hiding in plain sight generally tends to work out quite well. And it has for hundreds if not thousands of years. There are hidden aspects too, of course, things kept out of sight from the average person. Might I ask, what is a muggle? It is not a term I am familiar with.