Also here is the head mod defending a transphobe/chaser https://hexbear.net/comment/3762972
Hey, serious question, why is "-tard" still considered to be a slur? It's no longer used in any professional capacity (at least in the US), so it seems like it'd be more offensive to insist that it still applies to people who are intellectually disabled than to let it become another synonym for stupid, dumb, idiot, etc (which were all professional diagnosis as well btw). I can understand wanting to discourage its use as an insult if it's a professional diagnosis, but it's not considered one anymore.
Technically, yes, those are all ableist terms due to the way they enforce a hierarchy of cognitive ability. Calling somebody "stupid," "dumb," "idiotic," "moronic," "insane," or the r-slur in a pejorative manner is basically telling them that nothing they say is of value to you because you think their brain is less capable than your own of forming a coherent point. Some of these are just considered stronger than others for one reason or another.