Today is the day of seeing -phobia used for hate and discrimination, isn't it.
- it takes responsibility from the ppl doing the shitty thing (yes, _especially_ if you're going to argue "it's not referencing mental illness, it's like in 'hydrophobic'!" - oppression is not a force of nature) and misrepresents the mechanisms
- it's awkward to throw people with phobias in with all that
- it is often used to score easy points from more openly ableist beliefs, see "homophobia can be cured" etc.
Admittedly, German has an easier way out by simply using -feindlichkeit instead, but there are ways to do this differently in English as well.
Sadly my English is a bit shit and I don't have any idea which of the more often-propsed alternatives actually work well, but they're out there :)
examples of ableist language
I mean, these are cosmetic changes that come from the idea that most people don't actually mean it that way. Just like with other changes of that nature, like avoiding calling people/things idiots, stupid, r*t*rded, schizophrenic (in the meaning of "contradictory" or whatever), crazy etc, if one's simply looking for a way to express an actual ableist sentiment behind it in less offensive words, that's still shitty.
And these few examples were all from the realm of neurodivergency, I didn't include examples of when physical disabilities are used as metaphors for bad things. Which is also very, very often, and not doing that needs to be one part of that very same process.
But if you don't actually mean to insult by drawing on ableist concepts and it's just the first word that came to your mind, then trying to find alternatives is a great process to start.