Tell me about it

used as an ironic acknowledgment of one's familiarity with a difficult or unpleasant situation or experience described by someone else.

"My car broke down on the highway in the pouring rain, and I had to wait for hours for a tow truck." "Tell me about it," my friend replied, sighing as they clutched their own dead phone. (Their sigh and clutching the phone imply they're also stuck in a difficult situation).