“Woe to you, teachers of the law and Pharisees, you hypocrites! You clean the outside of the cup and dish, but inside they are full of greed and self-indulgence. Blind Pharisee! First clean the inside of the cup and dish, and then the outside also will be clean." Matthew 23:25-26
Rudeness occurs when the person offended did not deserve such treatment. Pushing an innocent bystander or interrupting a conversation is considered rude.
When a higher authority lambasts subordinates for something as serious as sending people to hell and maligning God, it sometimes calls for harsh words. They deserve the criticism. However, even a strong attack cannot budge a strong willed sinner. The Pharisees don’t hear one word Jesus said.
You don’t use pleasantries to get a donkey to budge. Jesus used verbal force to get the Pharisees to wake up their problem, but they won’t listen. Since they don’t listen, you can really see the problem – these religious leaders won’t submit to authority.
And the boss has every right to criticism unruly employees.