Yeah, no shit Willis has acknowledged it. He put his words in Carla's mouth in pic related.
The problem is that Carla is wrong. Everyone doesn't "get" to act like an asshole. Everyone gets away with being an asshole instead, because they have a fucking terrible RA.
Mary is right. Filter out all the homophobic shit from when she first blackmails Ruth and she's accusing Ruth of being a shitty RA who drinks on campus, sleeps with the students under her charge, and didn't just ignore, but was literally unaware of a homeless person, whatever the circumstances, moving into the dorm. When she does pay attention, it's to insult, assault (and not just Mary, remember she got in an outright fight with Billie in the long ago time of a month ago), and intimidate her dorm into not complaining about her to the higher-ups.
This storyline sucks because for however much of a bigoted asshole Mary is, reporting Ruth is necessary. She needs real help (but apparently Willis doesn't trust real help) and the dorm needs an RA who will keep the kids in line across the board. It could have been a good storyline in which she's called to account for all her mistakes and has to examine her own behavior. Instead we get a shitty revengefic with a dose of shitty polemic about how using mean words are bad even if someone is being a jerk. Real transcendent shit there.
Carla and Mary are just the symptoms; Ruth is the disease.