Your points were right on the mark until you got to the last sentence. I'd call it a little condescending, at best.
The last sentence was directed at those that read the first part and said, "I don't give a d#mn what a coach thinks, I'm in charge, and if he doesn't like it, tough noogies. I will dictate what will happen here."
And unfortunately, we run across a few of those each year. Thankfully, it is not the majority, but it tends to be the same officials to whom the first advice was needed.
Look, this isn't just a coach talking. In football, I have never officiated outside of college intramurals. But in baseball, I have an extensive resume at some pretty decent levels. The same thing exists there as well. If I'm the umpire and I need to let a coach know something, there is a polite way of doing it without being dictorial about it. Now, if he is out of control, there is a time and a place to handle confrontation, although I hate what I see with MLB umpires yelling back at coaches in an argument. There is no need. He gets a little room, I don't need to yell back, I just need to let him know we are done. If he chooses not to end it there, I will, then I walk away. There is never a need to yell or talk down to a coach, I don't care how big of an IDIOT he is being.