It's rude to tell people they are crazy.
During a debate about politics, George's friend Tom says something that he finds incorrect and outlandish.
George wants Tom to know he is wrong.
George uses logic and reasoning to explain to Tom why the views that he expressed are flawed.
George raises his voice and tells Tom that he is crazy and his views are ridiculous.
Tom realizes that he was wrong and thanks George for correcting him.
Tom gets defensive and doubles down on his views regardless of their validity.