No we're not! We're really, really not.
Please people who don't have autism or don't know anything about autism, please do not say this to people who do have autism or their carers/families.
It is wrong, it is offensive, it does a huge disservice to autistic people.
If you truly think this, do some reading. Or don't if you don't care - but stop saying it!
From one exhausted mother who has just had to have this conversation yet again with I'm someone who I thought was a good friend.