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Why do some people like to make fun of others as jokes?

It can only be said that such people have no culture and quality. A truly educated and capable person will never laugh at others' shortcomings, because everyone is equal in personality and everyone has his advantages and disadvantages, so the landlord should not care too much about those who like to laugh at others' shortcomings. It is said that after a mad dog bit you, do you still want to get down and bite back?