2. Why is Huck Finn universally admired by all of the boys in the school, but is also despised by most of the adults?

From the text:

Huckleberry was cordially hated and dreaded by all the mothers of the town, because he was idle and lawless and vulgar and bad—and because all their children admired him so, and delighted in his forbidden society, and wished they dared to be like him.