This sounds like you've only read DHH's description of events. Read the Platformer article for more context.
https://www.platformer.news/p/-what-really-happened-at-basec...
When I read that, I see business leaders who engaged for months then asked people to move on when they realized it was never going to go away.
Searching the chat logs and posting in front of everybody was a jerk move for an executive, absolutely.
Everything else seems entirely reasonable.
Just from the open letter (https://janeyang.org/2021/04/27/an-open-letter-to-jason-and-...) take a look at the kind of attitudes they have; these are some serious snowflakes:
"As you know, I am writing this while on medical leave from Basecamp, a condition that was necessary in large part because of the extreme emotional duress I have experienced as an employee at the company."