"Getting someone's case" is a colloquial expression often used to indicate that someone is being criticized or scolded in a confrontational manner. There are several synonyms for this phrase, including "giving someone a piece of your mind," "reprimanding someone," "calling someone out," "rebuking someone," and "chewing someone out." Each of these expressions highlights a different aspect of the act of scolding someone, but all convey the idea that the speaker is angry or disappointed with the person they are addressing. Regardless of which phrase is used, it's clear that "getting someone's case" is never a pleasant experience.
