Wow, the student union does seem to be trying to out-woke Titania McGrath. Good to see that such an absurd demand has been slapped down. I'm pretty sure the vast majority of students at Oxford university aren't as narrow minded nor have such delicate sensibilities.
Minority groups need 'protection' and trigger warnings from books and ideas that they disagree with? Makes you wonder how women's liberation and civil rights movements managed to get this far if we all fell to pieces due to a lack of 'protection' and trigger warnings in life. 
The sort of people who have this kind of mindset are the type that relish the concept of blasphemy. In years past, they would be first in line to call for the beheading or punishment of someone who offended their religious beliefs. These days the whole 'intersectionality and viewing everything as a hierarchy of oppression' has turning into a pseudo belief system that must never be questioned or criticised, and so they find their home in these sort of groups - making pronouncements of how offended they are by everything and everyone around them and demanding the rest of the world should change to suit their beliefs. They have appointed themselves as the moral guardians of the communities they claim to represent.