Thing is, how do the HM's deal with someone they don't like if they cannot get away from them.
If a person did a specific action that irritates (e.g. switch on the light when you're sleeping or always interrupt when you're talking) you would probably mention it to them.
But if you simply don't like a person's character - if you find them vain, egocentric, manipulative, arrogant etc. - what do you say?
In real life you would avoid such a person as much as possible and certainly not choose to live with them but the HM's have no choice.
So do they make an effort to be civil and vent their annoyances in private or say to Lisa "I don't like you because you're .... therefore I'm going to ignore you".
I don't know how I would react to Lisa if I was forced to live with her.