From what I can tell the "tar-and-feather thing" is outrage directed at Slack and its CXOs, rather than the poor guy who happens to be reposting a message from the CPO.

Please don't let your moderator's concern for injury to individual people blind you to the fact that the outrage triggered by outrageous conduct is directed at the outrageous company and its officers, rather than at individual folks who aren't in a position with any real power.