I don't get it

"S" is a forty something year old professional from an upper middle class background. The other day she was in tears because her boss at work was rude to her. She fucked up something and he told her (بلاش تخلف).

She was visibly very upset while she was telling me about it and she said, "How dare he talk to me like he was talking to his driver?"

I really don't get it. So is it okay to be rude to the driver, but an insult if it's directed at her? Poor driver.