[angry_octet]

It's a good reminder that 'conversations' on Slack/Teams etc are NOT conversations, they are posts on a company message board.

If you want an OTR conversation then do it in person (though they might record it on their phone or take a contemporaneous memo, a la Trump Whitehouse), or in Signals with expiring messages (though even then you might need to assume the other party is screen capping the messages).

So best of all is to assume your messages/chats will be leaked selectively. Avoid gossip and innuendo!