Why is it wrong for Hilly to have rules for her own employees?
I disagree with Hilly's Home Sanitation Bill that would require the members of the community with maids to have separate bathrooms for them, however, I don't see a problem with her making her own rules about the maids she hires.
If she doesn't want them using her bathroom, I think as an employer she has the right to tell the people she hires to use a different facility. Minnie has the choice of working for Hilly or finding someone else to work for (prior to the terrible awful). IF she didn't like not being able to use the Holbrook restroom, she could have left.
Hilly's a bitch and awful person, but she should be able to make the rules in her own house.