I found myself on the opposite side of the table from Roz politically about 20 years ago on a different issue, but on this one I broadly agree.
I've seen some nasty vitriolic comments on Twitter and elsewhere (including comments suggesting the threat of violence,) from both those who support the conference's exclusion policy and those who decry it. It has most certainly NOT been a one way street.
I part company with those who support exclusion on the contorted explanation of how one qualifies for the definition of "woman." I fundamentally disagree with the belief that this is an absolute concept both from my previous experience as a nurse and personal experience of knowing trans women who I experienced very much as being women.
I find it disappointing that some feminists seem to feel entitled to define the lived experiences of a group of people who face social, economic and political oppression due to institutionalised misogyny, institutionalised transphobia and resulting intersectional oppression. To me this seems the antithesis of everything I've known about feminism in the past 30 plus years. It's a glaring anomaly to acknowledge and support struggles against institutionalised oppression for other marginalised groups in society (and particularly women within those groups), but insist on an exception for just the one group.
I've heard scores of explanations as to why it is legitimate to exclude trans women from events, activities and facilities designated for women, have not been convinced by any of them and have been appalled by some of them. Some of the arguments and tactics remind me of the squirming, contorted "logic" offered by otherwise quite right on, left of centre men (particularly in The Guardian Comments section,) to justify and defend misogyny. In their case, I suspect it's because they can pretty easily disavow their privilege when it comes to things like racism and classism. But, because they still enjoy male privilege in their own personal relationships but don't want to "wear" that privilege, they have a vested interest in denying its existence - by any means necessary.
I'm also not happy to see some feminists dismiss trans and non-trans feminists as "fun fems," assuming that anyone who supports trans women's right to be regarded as women as also being defenders of porn, legitimisers of prostitution and generally just handmaidens of the patriarchy. I don't post here terribly often, but I would hope those who are familiar with my contributions will see how narrow and inaccurate this assumption is.
I know historically, some feminists have rejected the idea of including women whom they regarded as "other" (e.g. women of colour and working class women in the early 20th century, Lesbians in the early 70's, etc.) and I hope one day we'll all look back and see the exclusion of trans women as just another regrettable example of this consigned to history.
I still say what unites us as feminists is greater than what divides us. Join together to achieve common goals. Otherwise, it's just the bald men fighting over the comb while the patriarchal powers that be have a right old laugh at the impotence in our antics.