Because many of the people who share her views on the Trans issue are far right leaning, it's true. She's been tried and found guilty by association. But mostly they are simply people of the more traditional, nuclear family oriented, perhaps Christian, proudly patriotic Conservative / Republican persuasion that gets them lazily and cynically pegged as 'far right' these days, because nuance doesn't exist on the 'progressive' left.
It's that blunt instrument of 'progressive' political logic that says if every Royal Mail postbox is red, then surely everything red must be a Royal Mail postbox
The metaphorical swingometer employed by 'progressives' to determine a person's moral worth lurches very far and very fast to the right, and therefore to the Dark Side, once it ventures right of centre at all, I find. The concept of a 'moderate' or 'centre' right doesn't seem to exist any more. You are either on their side on everything, (pro-trans ideology, pro net zero, anti-police, pro Palestine, anti Israel, anti immigration control, pro-open borders, pro-DEI and critical race theory, pro-benefits increases, pro-higher taxes for 'the rich' whoever they are) or you are practically Hitler.
The irony is that many, if not most gender critical feminists would probably have considered themselves to be politically and socially liberal and left leaning before the madness of identity politics and DEI completely captured the Left. It's pushed old school, working class socialists of the Red Wall variety to the right and it's rendered many others politically homeless altogether.
The upshot of refusing to collude in the nonsense is that gender critical people have now been firmly dumped into the 'far right' camp along with anyone else who refuses to shut up and be policed for Wrong Think.
So it's true that feminists are now forced to share a platform with people they might consider to be misogynists on the issue of trans alone. But it's also interesting that many people who could previously never have imagined sitting on the same side of a debate with any right wing polemisist have had a bit of an epiphany. They've realised that many of them are much more reasonable, rational, intelligent, nuanced, tolerant and altogether more acceptable bedfellows than they previously thought.
I mean who'd have thought that Kathleen Stock would end up writing for the Times? I'm going to hazard a guess that she was a Guardian reader through and through, pre- 2021....
That's what happens when you give yourself permission to focus on what unites you rather than on what divides you. Something left wing 'progressives' are incapable of doing.