I think higher education is the perfect place, which is why I'm conflicted about the situation here. On the one hand, I am emotionally with those who are glad Greer is being shunned. It feels good, like her bigotry is totally invalid and has no place. But I am intellectually for her being allowed to speak, preferably in a debate setting. I don't think avoiding confrontation in this context does anything to move trans rights forward. If you are walking along a straight path, and suddenly find a boulder in your way, you can try for a while to push it, and then give up and walk around, but it will be there for the next person. If they do the same, then it will be there for the next person, and the next, and so on. I know there is much solidarity in LBGTQ communities, and here is a perfect place to work together to pulverize that boulder, instead of stepping around it. By avoiding her completely that solidarity proves itself, in a way, but as long as there are other people with the same bigotry, that rock will block the path forward.
Preventing offensive speech from even being offered prevents it from being challenged. To me this makes the offending ideals impossible to change, which is anathema to a higher education. There are likely people on that campus who have the same ideas as Greer. It is unfair to them and to their fellow students to not allow some disputation, in hopes of achieving progress.
These are still human beings, after all, and are not shackled to their bigotry. You don't have to treat their views respectfully, but if you meet their hate in kind you build a wall in opposition. You do not allow them to join in human solidarity. They are doing a good enough job erecting that wall already, and there is no need to help them along.