Words matter, otherwise verbal assault wouldn't constitute a hate crime (at least in the UK). You used an ableist word and that matters. The word has an interesting history, in case anyone is interested (see below) and using it is ableist given it used to be a psychiatric classification. I am assuming you wouldn't use the 'F' word to describe gay people or the 'N' word to describe black people. Those are just words, too, what makes them different?
Also, taking the "science doesn't care about your feelings" line of thinking is really lazy. We don't have to keep the status quo. In fact, it's generally good if we don't. I can see from your responses that you aren't interested in discussion, so I'm leaving it here. It's OK to be wrong about things sometimes. Maybe you are wrong about this. Maybe not, but maybe you are.