Mastodon is a bubble. You have primarily highly educated, tech-literate nerds on that platform.
Obviously people are more civil and polite there, than some raging uneducated losers and trolls on facebook.
As the fediverse grows, the userbase will obviously lose this current isolated tech-wizard school vibe, and feel more like going into a random pub in a big city. Regardless if Meta joins the fediverse or not.
When I used Facebook a few years ago, my feed was mostly memes, ads and personal posts from friends and family.
Maybe I never got the ragebait political stuff, because everyone in my friend circle wasn’t keen on being the sad guy that publicly yells at clouds on facebook.
Popular hashtags on Twitter and to some extend even on Mastodon, just makes you feel bad for the mental health of these perma-raging users tho.
Political spaces in general on every social platform are just magnets for misery.

I don’t get it. Are Google employees completely ignoring all the negative press their messaging apps get?
Everyone online agrees, that all these messaging apps that Google keeps pumping, just hurt each other.
Here is a list of every messaging app that Google has ever produced:
Android SMS
Bump!
Cloud to Device Messaging
Chat (not the same as Google Chat)
Disco
Dodgeball
Firebase Cloud Messaging
Gizmo5
Gmail
GTalkService
Google+
Google+ Hangouts (not the same as Google Hangouts)
Google+ Messenger
Google.com/talk
Google Allo
Google Assistant (it really did once have its own text feature)
Google Assistant Messages (and then this but only in a family group)
Google Buzz
Google Chat
Google Cloud Messaging
Google Docs
Google Docs Editor Chat
Google Duo
Google Fi
Google Friend Connect
Google Groups
Google Hangouts
Google Hangouts Chat
Google Hangouts Meet
Google Helpouts
Google Huddle
Google Latitude
Google Maps Messages
Google Meet
Google Messenger SMS
Google Pay Messages
Google Phone Messaging
Google Photos Messages
Google Schemer
Google Spaces (this was basically Google's version of Instagram and it lasted less than a year)
Google Stadia Messages
Google Talk
Google Voice
Google Voice Legacy
Google Voice Third-party Apps
Google Voice for G Suite
Google Voice FXO VoIP Gateway (Obihai)
Google Wave
GrandCentral Communications
Jaiku
Jibe Mobile
Meebo
Messages
Orkut
Postini
Slide
Sparrow
YouTube Messages
Redesigns are always perceived poorly. Every decrease in performance, every lost feature, every relocated setting is heavily felt by all the power-users. For new users tho, K9 probably became more viable/attractive.
Eventually people will get used to the design, performance issues will get fixed, new features will be (re)added and the rating will improve again.
Same thing happened with the Firefox Android Browser.
For me personally, K9’s design seemed very unintuitive and complicated, when I first tried it almost 10 years ago. FairEmail for me is a great compromise between usability and feature-richness.
K9 is probably completely different from a decade ago, but I guess I will wait until K9 has merged completely with Thunderbird, before I look into it again.
Or perhaps just read a book -> based