What do you call a stoned kid with down syndrome? A baked potato.
Are you honestly insulting people with disabilities right now?
Down Syndrome is not actually a disability but the lack of genetic material
Even if your joke is funny to some, I do not think that it is very nice of you to say that people with disabilities are called potato, as potatoes are very simple and do not move. Try to go to your local hospital where they house Down's Syndrome patients and see that they have goals and struggles the same way as you.
Uh...
Down syndrome is recognized as a disability, regardless of how it happens. Jokes like these highlight their disability in a way to put them down for a cheap laugh.