"Fuck TERFs" is vague. My post isn't that vague but let me try and crystallise it for you. If we're dividing people into gender-related groups (men, women, trans, feminist etc), biological women don't have to put themselves in the same group as trans people if they don't want to. Calling them a TERF and saying fuck them, if they don't want to, is lame. Chanting "fuck TERFs" seems like going down that road.