Calling out bad actors gives them an audience. Nine of your readers will agree that this person is a piece of shit but the tenth will think "hmm maybe there's some truth to this" and follow that bad actor. And that's how it propagates. No, nothing but blocks and silent treatment to people feeding on outrage.

In public sure, but this is the internet, where the Streisand effect is the unifying order of the week. It's why the age old saying "bad press is better than no press" exists