As for "toothy kindness" - I think all traditions are full...

As for "toothy kindness" - I think all traditions are full of this sort of tough kindness. If someone is on a wrong or dull path, and someone else startles them into awareness of that, then that's a blessing. And the method by which the startle is obtained might be anger, or satire, or an intentionally applied indifference. But that is, of course, a fine line.