How do you know it was social media? I contacted Slack's customer support and asked for a toggle. It could have been my request. The customer support chat was fast, friendly, and professional. I couldn't ask for more.
> "I apologize for the disruption to your existing workflows. Our aim is to build an editor that works for all Slack users to better format their messages and clearly communicate in channels, regardless of their technical expertise. While we are taking all feedback on board, disabling the new formatting tool isn't an option that we will be offering."[0]
It is of course possible that your particular request was super persuasive and caused them to change their mind, but the more likely explanation is the scale of the public backlash forced them to reconsider.