Lol to the younger brother story.
Yes you def sound proso. Most prosos are screwed if someone is out of context. There are lots of funny and frightening stories on the proso facebook group. One lady whinged about a boring lecturer to the lecturer, she didn't realise the lecturers use the same bathroom as the students.
One time a lady worked into my work, she was short, blonde bob, big nose, rather wide, always wore skirts, based on what suburb we were in, I placed her as someone from my son's playgroup. Wrong. She was the exact same description (we call those our unique identifiers, the more plain someone is, the more things you need to remember in combination to identify them, we love people with ONE unique identifier, a giant mole in the middle of their face is perfect). She was actually someone from head office, I owned a franchise and had just breached the agreement by buying another business while still under contract to them, it was only overlapping by a month and I figured they would never know. I told her everything. My ASD prevents me from recognising facial expressions and body language, I'm sure I should have noticed the shock on her face, but I didn't. Thankfully after much pleading and explaining they agreed not to sue us. It can be dangerous!
You should read up on it and consider being diagnosed. I was diagnosed late and if you're like me, you'll suddenly realise all the times you've probably ignored people you were supposed to know. The swimming teacher probably didn't change every week, the bus driver was likely always the same person too, so were the people on the bus you still didn't say hello to after 6 weeks because you didn't know they were the same. 