I think Lisa Keogh is allowed to have these views and potentially be challenged on them. She shouldn’t be subject to disciplinary procedures if she disagrees with someone.
Yes, this is the main point, I think.
Following through the Twitter links, and screen shots here, there seems to be an animosity between Ms Keogh and other students. Fair enough, they don't all have to be friends, but to "weaponise" the complaints system in this way is an overreaction.
But as PP have said, if a student makes a formal complaint, the university is bound to investigate it. However, there are levels of action.
At my place, they'd start with an informal mediation: bring both parties together to hear both points of view.
From what I can see, that's as far as this needs to go. The complainants and Ms Keogh should be told that it is OK for people to hold different views and to be disagreed with. And that they both need to do this in a way which is not dismissive or disrespectful of individuals in the room.
And they all need to be reminded that when discussing difficult subjects, a university seminar is looking at these things in the abstract, and no-one should take it personally.
I teach second-wave feminist cultural/literary history and theory. I always start by outlining the distinctions between sex (biological) and gender (cultural), and to insist on language which mirrors this men/male (sex) and masculine (gender), and female/woman (sex) and feminine (gender). I stress that we are not discussing individuals, but classes or categories, and social/cultural trends.
So I try to ensure there's an ethos in the class where the young men don't feel defensive about their sex, and can discuss gender stereotypes more freely.
It's possible to do this, I would imagine, with students with experiences of violence and sexual violence. In fact, for female survivors of abuse or sexual violence, it might be quite liberating to have these discussions - to see the cultural trends, and feel less like it's their individual "fault."