I think in any large organization, you are going to find people that think like this/talk like this. These emails are bad and the culture definitely needs to change, but who hasn't heard someone refer to their manager as a clown? No matter how good or bad your boss is, sometimes people are just going to complain.
"this airplane is designed by clowns, who in turn are supervised by monkeys."
"this airplane is designed by clowns, who in turn are supervised by monkeys."