Is "slighly prejudiced" anything like "a little bit pregnant?"

Said co-worker can choose whether or not to bike ride with whom she chooses for whatever reason floats her boat, but as it's been pointed out, it is bad for her boss's business if she is treating the customers poorly because they are not members of the right skin color or religion club. There are laws covering that. If she wants to keep her job, she'd better grin and bear it, and treat ALL the customers the same. Either be pleasant to everyone or be cold to everyone.