"Cancel culture" is one of the dumbest fads this year. It's a new, vague name for things that already have a name: boycott, mobbing, witchhunting, censorship, etc., depending on who or how you are "canceling".

Judging by how I've seen it used in social media, it's a loud way to band together and harass someone before bothering to research facts or context, feel morally superior, and at the same time achieve nothing of consequence.