I am serious about his speech yes. I love what he has to say about it. I didn't look up a think about him otherwise, nor do I care. It was the speech and the way it was delivered.
He's saying how people saying "Those who can't teach" is just a load of shit and when you judge someone by the amount of money they make that it's a load of shit as well. And that teachers are very important and underrated in what they do.
I know nothing about him, didn't even know his name. My husband just sent me the youtube link and I liked what he had to say for obvious reasons. There were many days when I felt and expressed myself the same way.