If we change how we define "lesson" we can learn from anything. Too often while we're busy being offended, we miss a bad example that can be an education to us in and of itself.
Learn from the actions and content of others, not the way they package it (with yelling, cursing, offensive gestures, etc...).
We can avoid many unnecessary troubles in the future by learning from the errors and mistakes of others.
Can you expand your definition of "lesson"?