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It has kind of become a designation for people who's feminism isn't intersectional.
This feels like question-begging and, again, a much wider statement is being used to mean something very specific i.e., people who don't believe that trans-women should be considered women in a feminist analysis. That has nothing to do with intersectionality, which primarily recognises the different life experience of the huge range of women in the world and that intersections of people's identities can create novel forms of oppression that cannot be addressed by analysing a single "axis" of oppression.
I didn't call you a TERF, all i did is call out the claim that the term TERF is designed as an insult. I acknowledge that TERF is being used to call out people for more then just being a trans exclusive radical feminist. It has kind of become a designation for people who's feminism isn't intersectional. Calling someone a trap is offensive because it dehumanizes trans people. Calling someone a TERF isn't dehumanizing anyone. Calling someone a racist slur is offensive because it's dehumanizing . Calling someone a racist is not dehumanizing. It's calling someone out for what they say or believe.
Now for some epic wtfness, in 2016 a Dutch politician was found guilty in court for offending another politician by calling him a racist. This politician said several racist things like he isn't opposed to religious schools except when they are Islamic or that dutch citizens with an immigrant background should receive harsher sentences then white citizens.