1) The belief that adults are superior to minors. It is so widespread and common that most people don't even know adultism exists.
Corrupted scientists use junk science (incorrect scientific facts) to try and justify adultism. Unfortunately, it works.
Most people think pictures of an adult's brain and a teenager's brain can be compared to argue that adult's are superior in every way possible. -_-
Adult: No, you are just 16 years old. Your brain is not developed enough to debate in this adult topic.
*and some more adultism*
Tom: Why can't I watch Family Guy, dad?
Dad: I want you to stay as innocent as possible throughout your childhood.
Tom: Epic fail!
Many deprived children can develop serious depression from this and develop a feeling of hopelessness as well as psychotic problems.
Father: "No you cant your 16, and anyway I own you you cant do that to my body."
Son: "You silly adultist."
Adultism is bad.
An elderly lady is in line at the post office. A ten year old hits her repeatedly in the leg with a nerf bat. The parent does nothing. The elderly woman asks the child to please stop. The parent screams at the lady for being rude to her child and accuses her of adultism.
A child runs behind the counter at a coffee shop, trips the employees, and knocks over hot drinks and glass cups. The shop owner asks the parent to keep her child from behind the counter. The mother accuses the establishment of discrimination against her child (adultism).
She caught Adultism.
OMG, no wonder she's so boring!