I think words like ableist and other such buzz words are unhelpful and divisive
The reality is that the majority of the world do not have dyslexia, nor do the majority lie on the ND pathway, so its human nature to see other peoples behaviours within social norms and parameters. Personally I prefer it if someone picks up my grammar and spelling at my age Im making mistakes I never made before, so wouldnt be offended if someone points them out, I like to know
My sister is also 'sweet', she wouldnt harm a fly, she has no ill intent or malice in her. But she presents as very rude, she is seen as odd, she doesnt understand social norms and cues, she doesnt have the skills and doesnt see why she needs the skills to present differently. She has a good job, a nice house, a partner( who is the same by the way) but has no friends and she has suffered with depression in the past.
If someone were describing an encounter with her, on here for example and asking others their opinions, no doubt there would be cries of 'she sounds like a twat' and other insults that I see a lot of.
So yes, people will see socially inappropriate/strange/weird behaviour as 'twattish' (mumsnets favourite insult it seems) and apply as necessary.