Cancer is a disease caused by improper cell growth and Autism is a mental challenge commonly characterized by a weakness in social interaction, respectively. In many fandoms and hatedoms, these two words are often used to describe something that they consider "bad", "dumb" or "cringy".
Why This Move is Rotten
These insults like the "AIDS" insults, "Gay and Lesbians" insults, and "Retarded" insults are very disrespectful and/or offensive towards people who have autism and/or cancer.
They are ironically very defensive over their usage of these words.
Despite their belief, people with autism can be smart. In fact, some reports show that those with autism might actually have a higher average IQ.
Some of them are hypocrites, they are using autism and cancer as insults yet some of them have autism and/or cancer.
Those who use these words as insults will use them constantly, spamming it almost everywhere.
They even compare autistic people to the likes of Chris-Chan, despite the fact that they're nothing like her.
They'll attack anyone who rightfully calls them out for the usage of these words. They'll wrongfully call them SJWs and call them out for being politically correct. Political correctness may be bad, but not to a certain degree!
These comments are almost everywhere on the internet.
They find autism and cancer funny when people in real-life, actually have them and they never seem to care about it.
They use the Internet as an excuse to justify using cancer and autism as insults.
They also use other diseases or conditions as insults.
Some just hate them because they think they get more attention than normal people do.