That's a whole lot of retards.
The left is enamored with the idea that by changing vocabulary you can change how people think. It's a subset of their foundational belief that human beings are entirely products of their environment and can be (re-)programmed.
It's why they get so butt-hurt over IQ studies and crime statistics.
What they can't wrap their middling little brains around is no matter what euphemism you use for shit, it still smells the same.
Call someone who's retarded anything you want, that'll become the new insult. Why? Because the insult is that despite not being afflicted with a medical condition entirely out of your control, you're still as fucking stupid as someone who is. It's not an insult to those unfortunates, it's an insult to those who should be better, but aren't.
And that will always apply to the left.