>in a feminist safe space where the topic of the meeting is about the systematic culture of sexual assault and consent transgression on our campus, bringing up false rape accusations is inappropriate.

As much as I agree with most feminist positions, this attitude (which I have found far to prevalent in almost all feminist communities I have been a part of) has been the biggest turn off to my participation, and I imagine that of many others. When your forbid certain topics/opinions from being brought up in your space, you can no longer have a complete conversation, and you alienate potential participants. There are defiantly spaces where it is appropriate to do so (such as a support group), but dismissing a good-faith comment as inappropriate seems wildly inappropriate for a group about social change.
By the account presented here, Dudebro 1 left the group with a false (and negative) perception of it. Additionally, the author actively rejected his attempt at a discourse on the subject, limiting her own exposure (and her group's exposure) to an alterntative point of view. That Dudebro 1 had been charged for sexual assault (wheather he is guilty or not), only strengthens the fact that he brings a unique perspective to the discussion.
The argument that this idea is "triggering to survivors of sexual assault" would be valid if you were a support group, but you are a feminist (and I presume activist) group, simply because some people can not handle the conversation does not mean that the conversation is inappropriate.
Of course, I could be misunderstanding the situation(s). If you are a feel-good group instead of an activist group, then your actions are fine (and there is nothing wrong with being a feel-good group). Similarly, if you had reason to believe these men were acting in bad-faith, your actions would be fine.