You should spend some time defining "cancelling." What is it? My definition would be something like "de-platforming" i.e., cancelling social media accounts or removing books from distribution. In this context, it is undeniable that there is a recent trend of cancelling voices that platform owners consider offensive or insensitive. I believe this is what people mean by "cancel culture."
The question is not whether public figures should be held accountable for their speech, but whether Twitter, Facebook, YouTube and others should censor speech that they deem inappropriate.