J.K. Rowling, Dave Chapelle, and Dawkins are examples. Each took hits of varying degrees and were harassed without relent on social media for innocuous and even accurate statements.
What "innocuous and even accurate" statements are you referring to, and in what sense were they "canceled"?
Rowling with her accidental like of a post on Twitter, which she unliked/took down as soon as she realized her mistake. She apologized but has been harassed ever since. The harassment got even worse when she essentially told those people to go F themselves, which I admire her for. She is still reviled among that crowd.
Dawkins pointed out that yes, there are men and women. Crazy stuff I know.
Chapelle took a trans comedian on the road to open for him. In his act he made a joke about how she bombed her first night out, but then got better after time went on. For that, he has been castigated.
Reasonable people don't like that shit. Also, things like that get associated with the Dem party, which the Dem party then tacitly supports these extremists by not publicly rejecting those extremists, so people associate extremist nonsense with the party.
Other terms like "white people problems" and "male toxicity," both of which are usually made in sweeping generalities are other things that exclude millions from the party. Why the DNC doesn't come out and reject those sweeping generalities is beyond me.
These attitudes come from a tiny percentage of the voting population but they have an outsized voice that damages the whole; and the Dems don't do anything to fix it.