@OldCrone
The Tories have plenty of genderists and they also have the first trans MP, Jamie Wallis. There are also dissenting voices within Labour, the SNP and Plaid.
OK, but are the Tories in question arguing, "these are my traditional conservative values, and they lead to supporting trans-activism for such and such reasons"?
Are there right-wing lobby groups pushing this?
Are there right-wing thinkers advocating that this is a natural extension of right-wing ideology and values?
Are all gay men and lesbians left wing? That seems an odd assumption to make.
Well no, but gay and lesbian charities and activist groups have virtually all been on the left-wing.
Maybe there are exceptions like a Republican gay organisation, but they are very much on the left.
Academic theories of gender come from academics. Are all academics left wing? That seems an odd assumption to make.
No, but gender stuff I'm guessing it's very likely coming from the left-wing.
You think theories about gender being a social construct and anyone can be a man or woman if they identify that way is going to be coming from right-wing academics? That seems strange.
You also seem to be making the common mistake of having assumed that all genderists are left wing then it follows that all left wing people must be genderists.
No, I think the polling shows that plenty of people on the left don't support it.
But that's distinct from the question of the streams that produced it.