jo's comment may have been less problematic than others made, but it was still ignorant and worth critisising in it's own right.
Sometimes, too, the mainstream ones are more damaging. The nasty fuckwits are easy to pull apart, and they're probably the kind of people who would be ranting without effect to the bartender or the shopkeeper if they didn't have the Mail. One of the reasons I chose to flag up Jo's comment is that it felt to me like a particularly lazy assembling of a number of themes that are common to the Mail's spin on transgender stories: a focus on the surface; an astonishingly literal (mis)interpretation of the cliché about "not feeling comfortable in one's body"; and a lack of awareness that what she was saying might not be helpful, might not be as progressive as she hoped.
I agree, Malcolm, that the comments are the tail of a shitty dog. I'd point out, though, that it's not just about changing misguided attitudes, it's also about building up your own defences against them. Dacre's drip is effective, it influences many people we know and even some people we love (including ourselves?). We have to steel ourselves against that. I think that by mocking the likes of Jo, I'm creating space for myself to react in a more level-headed and less emotional way when a real-life person expresses a similar attitude. I'm prepared for it, I've seen it before, I know what I don't like about it — and, crucially, I can see where it comes from. I can locate it as being an opinion the person has picked up casually from the media, rather than evidence of inherent bigotry or other nastiness. This is important, because otherwise I don't think I could live in the world. I'm a juicy target for bullies, and I've learned not to expect support from well-meaning people who haven't thought their opinions through. Not only does posting here, as you say, give me a clearer idea of what I'm up against, it also provides support and solidarity — at the expense of Jo, perhaps, but so be it.