"At the end of the day...."

FUCK I hate when people say this. It's like they're too lazy articulate themselves. I know this one guy at work who's always like "Well, I after everything, I had to tell the customer, listen...at the end of the day, we just can't do this" At the end of what day?? Today?? Yesterday?? What do you mean 'at the end of the day'? What happened during the actual day moron?