If believing that humans can't change sex is now a right wing position and believing that they can (or at least that a person's subjectively experienced gender identity, and not their biological sex, is what makes them a man or a woman) is now a left wing position, that does not mean that having the former point of view means you are endorsing the political right or that you agree with the political right on any other issue.
It is, as you say, common sense versus nonsense.
Sadly, too many people on the political left seem to believe that in order to stay on the political left you need to adopt the latter point of view even if it is nonsense, because that is what the political left believes.
I am beyond furious that the political left have put women in a position where we either have to agree that our rights are less important than those of male people who believe they identify as women, or occupy common ground with people whose politics we otherwise deplore, including, in some cases, people who would deny us the right to have an abortion.
I also find it extraordinary that people who insist, apparently sincerely, that it is not possible to neatly divide all humans into "male" and "female" in a binary manner seem to believe that we can and should neatly divide all humans into "good people who agree with us about everything" and "bad people who disagree with us about everything".
It means I find myself up against people I otherwise respect and agree with about most things who insist on dismissing my point of view because really, when has Suella Braverman ever been on the right side of history? Maybe never. Maybe this is the first and last time Suella Braverman will ever be right about anything. But that doesn't make her wrong on this issue.
And I fear that there are only two potential outcomes here. Either the gender ideologues win, and women lose their language, their single sex spaces and their sports permanently (helped along by the women who passionately disagree but ultimately decide they can't afford to let the Tories remain in power any longer), or the political left sees the way the wind of public opinion is blowing, quietly backs down, and we all have to forgive them and forget it ever happened because they're not the Tories. Obviously I hope it will be the latter, but they absolutely do not deserve to be forgiven.
That's a bit of a tangent from Russell Brand, sorry, but I'm struggling to care all that much about Russell Brand. Obviously it's terrible if he hurt women, but to me it's just another day, yet another man behaving as though women are just resources to be exploited. And unfortunately there are people on both sides of the gender debate who think female people only exist to serve male people.