Pointless argument as the GRA isn't going to be repealed. Don't see what purpose this serves apart from spreading general hostility towards trans people? It's a bit like constantly spouting that gay marriage should be banned and gay people shouldn't have equal rights - pointless because it's already law and isn't being challenged by any political party.
Gender self-ID is not law yet - and women still have exemptions written into the Equality Act - even if many people are choosing to ignore them.
If it weren't for women like Posie, Julie Bindel, Julia Long, Jean Hatchet, Karen I-S, Joan MacFarlane, Joanna Cherry, and many others, self ID would probably be law already. TRA orgs thought they could sneak it through without even consulting women. They've failed - so far - and there IS a debate. More and more people are realising the impact of gender self ID on women.
There is everything to fight for.