I think there's a useful distinction between the transphobic feminist whose transphobia is an unaware reflection of the dominant culture and the TERF whose transphobia arises from a coherent philosophical construction of feminism that is aligned with radical feminisim. Using TERF for both (or going further and using radfem in place of TERF) diminishes the communication content of the term.
(I mean, they can all fuck off, but there's no need to cede linguistic territory to them.)
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