The first four terms became associated with disabilities through the medical field. The first two terms were categories on the IQ-Scale (idiot is the one that comes before imbecile in that scale, btb). The third is a shortening of a medical term conflated with another (spasticity and clonus) and the fourth is another psychological term referring to similar things as the first two.

Those were originally meant to be clinical but have been abused by those people, they also were created from outside the community (special needs most likely too, as it is a euphemism). I am unsure about “Acoustic”, that might be embracing of a meme, unless it was used as a euphemism for autism by non-autistic people.

Neurodivergent is different, this is a term coined by a part of the community. I am not sure whether the term endonym is accurate here but it is similar in nature.

Without any context I was so confused why some parts of the text were bolder than others x.x

If I understand it correctly it’s to aid in speed reading, right?