Your friend was just fired from his job because of rudeness to his employer.
Talk to him about this.
Hey, you know what they say.
People may be offended by the way you speak.
Humans are emotional creatures.
So, if you give no consideration to the other person's feelings,
this means you don't recognize the person as a human being.
That's why we should be careful of our language and attitude.
You know what they say. ：ことわざにあるじゃない。◆ことわざを引用する前に言う
