Autism is essentially the condition of lacking social skills and being obsessed with order - or at the very least, those are the core systems that separate autism from other neurological conditions. The condition of being a retard has to do with intelligence. Occasionally you may encounter somebody with both conditions. These people will typically be referred to as "autistic" simply because it sounds nicer than "retard", even if they are technically an autistic retard.
Armed with this new knowledge, here are the correct ways to use these terms:
-If someone is crying over how their routine is ruined, then you may call them autistic.
-Same thing if they're crying over how their plans are ruined.
-If they said something in a context that shows that they lack basic social skills - like asking Grandma if she's pregnant during a Christmas gathering - then you may call them autistic.
-If somebody is acting stupid, then you may call them a retard.
-If they are doing all of the above at the same time, then feel free to call them an autistic retard.
-While we're at it, if something is lame, feel free to say it's gay.
I mean really, guys, there's minor screw-ups in grammar and then there's this colossal word usage failure. Regardless, you retards are now educated.
I highly recommend testing your new knowledge in front of a Special Ed worker. I'm sure he or she will be extremely pleased with your correct usage of the terms!
This thread is now about how cute cats are in laundry baskets:
This thread is now about whether my cat's fur looks like a heart or "something else":