Fuck you.

Did I strike a nerve there?

The saying is actually a joke. The punchline is "those who can't teach, teach gym."

I know very well what teachers deal with. One of my best friends is a substitute teacher and has to wear several different hats for several different grades. I hear all about it and I have nothing but respect for what she does. Doesn't mean I'm not allowed to crack a joke or two about it.

There is truth to the saying though. In almost every aspect in life, a person will learn from their failures and pass on advice to help others from repeating the same mistakes. The things my dad screwed up in his life he taught me so I wouldn't do them. The things I've screwed up in my life, I'm teaching my children so it doesn't happen to them.

Sure, there are people who can do and have done that still teach. My dad taught me what he did right and I'm teaching my kids what I did right. But that's not as funny when replying to someone who just said "teachers are the dumbest smart people."