aphantasia

Aphantasia is a misnomer, commonly referring to the inability to create pictures or images within your head. It affects less than 2% of the population. It does not affect visual memory or imagination/creativity.
A good metaphor is if you imagine your brain as a computer, your eyes as a keyboard, and your mind's eye as a monitor. The computer and keyboard still work, but the monitor is unplugged.

"I have aphantasia."
"What is that?"
"It's a condition that means I can't visualize something."

Gen Z

Generation Z, abbreviated as Gen Z or colloquially as Zoomers. It is typically defined as anyone born between 1996 and 2010.
Gen Z is one of the most controversial and hated generations, but also one of the most progressive generations. Most Gen Z people generally value individual choice and freedom over conformity. This is probably why the other generations cry like little pissbabies that don't understand that others have different world views.
Gen Z parents generally take a different, more open parenting style, allowing their children to develop their identity independently.

"Gen Z is the youngest generation, right?"
"No, it's now Gen Alpha."

Autism

Autism, more correctly referred to in the DSM 5 as Autism Spectrum Disorder (ASD), is a developmental disorder characterized by many different symptoms, hence why it is called a spectrum. Many autistic people are high functioning, and don't obsess over trains. Some of the most common symptoms include:
- Lack of social awareness
- Sensory/overstimulation
- Hyperfixation
- Trouble making or keeping eye contact
- Unusual tone when speaking

"Are you autistic?"
"Please don't ask people if they have autism."
"I'm sorry."