The problem with punishment is it uses shame, rather than teaching and reflection, as the tool to address what is at best a clumsy misstatement and at worst a failure of understanding. Shame doesn’t foster a better relationship with the truth, or history; it simply forces silence, and that can breed resentment. In turn, silence and resentment fuel antisemitism. The better answer in these situations is obvious, but not easy: education, education, education.
What I’d like to point out, in brief, is that while the technology is new, the phenomenon is not. The “tyranny of the majority” in public opinion — the way it enforces conformity and reprimands dissent — has been part of American life reaching back to the beginning. And there’s even a case to make that it is intrinsic to democracy and democratic life, an inescapable consequence of the leveling spirit.