People do get cancelled and deplatformed for dumb and unfair reasons, and there are elements of the cultural left prone to shutting down, rather than engaging with, reasonable disagreement.
But addressing those problems gets lost in the crying wolf of a cultural right that, motivated by status anxiety, labels as "cancel culture" others' exercise of their freedom of association, and demands to be respected, platformed, and listened to, no matter how ugly and bigoted their proudly stated views.