Teaching a pig to sing

A quote from Robert Heinlein: Never try to teach a pig to sing; it wastes your time and it annoys the pig.

Usually applied to someone that has a character flaw or annoying habit they will never change because they simply aren't able to.

A person with bad hygiene - you tell them they stink but they don't really care.
"Getting you to clean your room is like teaching a pig to sing; it's a waste of my time and all it does is annoy you."

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