I met a friend with autism when we worked together years ago. One day he came to me and said "I've been talking to some people and doing some tests and it looks like I might have autism."
I looked at him for a few seconds and said "wait, you didn't know?"
"You knew and didn't say anything?!"
"Well I thought you knew! It's not really casual work chat 'hey man, how was your weekend? BTW looks like you're a bit autistic'"
Ilovechai