Why was Liza so rude to the help?
By her own admission, Liza was some slut secretary/dancer/unsuccessful fashion designer who was two seconds away from going on welfare before her gay uncle left her a cursed hotel, right? So then, she inherits this hotel through no hard work of her own — and the minute she gets there, she starts being a bitch to the staff.
"Ugh, Martha, are you finished cleaning yet?" "Ugh, Arthur, what are you doing in MY room?"