Accents?

I don't understand why anyone would make fun of anyone with an accent. Maybe it's weird to one such person as a child but it should sound lovely also. It makes no sense. Like british accents. They are so beautiful and graceful. Hispanic accents, so lovely. WHy would you make fun of such a glorious thing as an accent? Why would a child criticise? Why would that make sense when the world is made up of these wonderfully beautiful people?