Well, she's not going to set up a privacy screen for him, and his clothes need scrubbing as much as the rest of him. She's assuming he'll just pile in, fully clothed, which is just as well. If he had more privacy, he'd probably just use it to sneak off.

"'Bean'?" she asks as she wipes down the counter. "What is that, some kind of slur?" Her tone is more playful than reproachful, but even harmless slang isn't the sort of thing you honestly use to address people to their face.