Are mentally disabled people worthy of derision, as the quote seems to imply?

Question: Do you seriously believe that either person was actually deriding mentally handicapped persons?

Is it possible that they were perhaps suggesting that on occasions, persons who are usually judged to be of 'normal' mental capacities; make questionable decisions and assertions that might, in isolation, cause them to be accessed far below their 'normal' faculties, such that they would, in isolation, rate them statistically as 'below normal'?

If so. That is, if there is even a possibility that they are not attempting to deride those whom society/statistics judge to be of 'below normal mental acuity'; but rather poking fun at those of often above normal abilities, that for some reason -- technical blind spots; oversensitive defensiveness; academic indoctrination; or simply lackadaisical research, effort or thought -- occasionally or habitually make, and worse, defend, demonstrably incorrect technical judgements, assertions and assumptions; then aren't you making the lot of mentally disabled people worse, by making an issue of this?

That is, by making a big issue of small, and highly questionable infractions of social awareness issues, you make it harder for the real issues to be discussed and addressed; because you make people afraid to even mention them for fear of falling foul of the self-appointed, oversensitive gatekeepers of political correctness.

Please note: there are three questions there. No judgements; no assertions; no condemnations.