The n-word is a slur, yes, that has no bearing on whether other words are slurs or not. Do you have a point or should I just accept that whatever word you deem a slur, is one?
I'm not sure how specifically you would define "slur," and I'd be curious to learn, but to my mind "a word used almost universally to defame and cast hyperbolic, inaccurate aspersions on an outgroup" seems like a reasonable working definition that encapsulates all other slurs as well as this one.
[0] https://mobile.twitter.com/search?q=TERF&src=typed_query
Though I supose from their point of view, asking for basic decency is akin to oppression. Fitting, considering the original topic.