I got the impression from the article that she put everyone's backs up, which is not a good way of getting your message across, imo.
That's the same message that's being pushed back at the Black Lives Matter protestors - you shouldn't take the knee, that's disrespecting our flag/the servicemen/the nation. If you don't ruffle anyone's feathers you aren't protesting, and if you aren't protesting things don't change.
One of the reasons people took umbrage at the likes of Andrea Dworkin and Julie Bindel (who wrote the Guardian article) is that they weren't content to work within the confines of the system that they objected to because it defined the 'acceptable' way for them to voice their complaints.
Objectively I find Bindel's repeated suggestion that the solution to the worlds ills is to lock men up in camps where they can drive quad-bikes and go fishing to be distasteful, but it makes people who would otherwise dismiss her out of hand sit up and pay attention.
There's a difference between radicalism and extremism; I don't know much about Dworkin, Bindel unfortunately ticks both boxes but I'm not sure how easy it is to be radical without being accused of being extremist by those who your radicalism seeks to disrupt.
O.