"Non transwomen" are - surely - MEN?
Now, Peter Tatchell's argument in a tweet cited above is:
The best way to resolve this issue is by peaceful protest & by rational, evidence-based ideas that show why trans women are not a threat to non-trans women.
Tatchell seems to be attempting to create a binary and I mention this because @LadyPrincesexual aka janeclarejones has recently written about binary matters and it's very thought-provoking. A very simplified tl;dr would be that in that binary of trans women and non-trans women, it is the non-trans women would be subordinate in the hierarchy...
Okay… so a binary isn’t ‘X or Y.’ As I’ve said, binaries work by being both a) hierarchical and b) by defining the ‘inferior’ term by negation. A binary isn’t constituted as ‘X or Y,’ it’s constituted as ‘X and not-X.’ ‘European’ vs. ‘African’ is not a binary. The racial binary is constructed by white supremacy, and conceptually it functions around the contradiction, ‘white/not-white.’ So, to look at a specific instance, ‘Blackness’ is constituted by the white imagination as an inversion of the privileged qualities of ‘whiteness.’ (Particularly in this case, ‘civilized vs. not-civilized (primitive)’, ‘rational (mind) vs. not-rational (emotional, sensual, embodied), ‘human vs. not-human (animal).’
This whole thing gets into a right mess here, however, because the gender binary and racial binaries don’t map exactly onto each other. The gender binary is laid on top of the biological difference between male and female people. The racial binary isn’t actually one thing, because the ‘white/not-white’-structure functions in reality as a conceptual relation between ‘whiteness’ and various different ‘types’ of ‘non-whiteness.’ Therefore, you can’t make a straight analogy here.[1] The structure of the gender binary is harmful because it is hierarchical, and because it ties sexed bodies to certain types of acceptable social behaviours, but if we follow through on the analogy used here, what we get is the claim that the ‘real’ harm of the gender binary is that it erases the other ‘natural’ differences it’s laid on top of – i.e. that it erases the people who are neither male or female, which would be, actually, nobody.
janeclarejones.com/2018/11/08/on-the-being-of-female-people/