Slack culture.

Yes, the chat application.

Fuck it, fuck mattermost, HipChat, Skype, and whatever other digital text medium for team communication.

These are great applications, but used for great evil. They feed cliques and passive aggressive "side" conversations. Every team I've been on has something like this, and it allows people to cultivate hate for one another even though they're sitting in the same room.

Texting allows you to complain about a coworker to your clique. Each clique can have it's own thread. This empowers people to silently rip into other team members. It prevents rational adult conversations and builds stupid little secret societies.