I’m commenting about how “tHiS iSn’T ReAl!!!” comments are so hilariously off-base, so much so my own child and his friends comment on how absurd the number of 20 to 30 something cane people are everywhere

And you don't think, "hey this is a learning opportunity for them, I can teach them the value of minding their own business, not judging people based on how they look, not making assumptions about people based on what I see" ? I don't think you're really helping your point the way you think you are. You said yourself they call them derogatory terms.

I think it says something more about society that a significant chunk of our young adults have convinced themselves they have some sort of unspecific, incurable, un-diagnosable malady. It's actually super fucked up

I think it says a lot about you that you look at people and automatically assume your assessment of them is accurate. That you allow your child to talk shit about them.

I trust my eyes more than anything, and I see more vaguely-disabled people than ever, especially the 20-40 age group. I'm sorry you can't accept this, nor understand why this is not good

So your eyes alone tell you that these young adults have convinced themselves they have some sort of incurable malady? Impressive. You still also dodge answering why you think it’s acceptable for your kid to call people derogatory terms.