https://en.wikipedia.org/wiki/False_memory#Mandela_effect

"I reject your reality, and substitute my own."

It means you were only interested in apartheid when it was on TV a lot, you completely missed the ending (and all news involving South Africa for the next 30 years), then you get all mystical about it because you think you're psychic. "I'm not dumb, actually reality changed..."

Meanwhile, a bunch of other people who also don't pay attention to world events refer to this woman's ignorance as if it means something because the name that the psychic made up to describe it sounds scientifiky.

They retconned it as a typo for antipode in their headcanon.