The Serious People are the ones who become the kind of teachers that ignore beauty and creativity and instead focus on making their charges fit into a snug, small, logical, box.  They’re the kind of people that spend their lives criticizing instead of building.  The people who like to talk about fallacies and logic, but end up just using those things to their own ends.  And the Sweet People are their easiest targets, because the Sweet People are hardly ever logical.