Treat somebody like dirt - Idioms by The Free Dictionary
treat somebody like dirt
treat (one) like dirt
To treat one very poorly or disrespectfully; to treat one as having no value. I'm not surprised that so many of your employees are quitting—you treat them like dirt!
treat somebody like ˈdirt (informal) treat somebody very badly and without respect: He treated his wife like dirt. She finally left him after ten terrible years.