Dont the Dunning-Kruger effect takes care of explaining why someone who thinks all they need to know could be labouring under a cognitive dissonance. In short he's too ignorant to actually know he's ignorant.
You want a link to that 1 in 3 statistic:
www.telegraph.co.uk/women/womens-life/11343380/Sexually-assault-1-in-3-UK-female-students-victim-on-campus.html
Of course you don't need to have a good grasp of the problem to criticize any proposals, but I'm afraid you are in danger of not being taken particularly seriously. You weren't even well read up on the news item of relevance to know he had posted an asinine picture of himself stating this wasn't what a rapist looks like.
Your whole support of the man in question stems from an empathy towards his position, and believe it or not I'm capable of empathizing with him as well. However his entire position is based on a faulty premise. First the whole point of the workshop is not about blaming men, it's about raising awareness of a problem that plagues UK universities. There is no implication from being asked to attend a workshop that anyone whatsoever thinks he is a rapist or even a potential one.
In fact if he is an A* star student on the complexities of consent you ideally want him there to have the floor for a moment as an example of how people should behave re: consent. If your trying to generate a decent social environment for everyone to study and network free from any form of sexual abuse, you need to establish that as the normal dominant paradigm within which everyone operates.
Essentially you either agree that rape and sexual assaults at UK Universities are things we should stamp out or you don't. I wouldn't actually knock anyone trying to do anything about it, unless you're willing to submit a workable alternative. Otherwise being critical is only just so much mental masturbation on your part. Besides all you bring at this point is your opinion, backed up with very little constructive evidence. Might I respectfully respect you refrain from adding anything else , as all you are doing is restating your opinion ad nauseum. We know your position and don't subscribe to it. If you have anything at all evidence based or constructive to bring I'm all ears.