We all agree terf has not been a useful term for a long time, it implies they're feminists, it implies they're for women, it reinforces their arguments that they're on the side of women and gives them space to hide their more extreme elements.
Why not something like cis-supremacist? Something that is far-right adjacent would be useful in making people properly make this connection, especially given who they're allying with lately.
Also they arent marginalized enough for calling them this to be making them look ridiculous, they're actually representing a wave of transphobic reaction so for me it just pisses me off if someone starts going like "oooooh the icky icky poo poos are here", like shut the fuck up dont you know what the fuck they're trying to do right now?