I think you can look at it this way:
* For normal people, Twitter is not real life.
* For journalists, Twitter is real life.
Journalists then become the vector by which BS Twitter drama becomes mainstreamed.
Yes, journalists are overrepresented there and yes, their journalism often degenerates into "we are covering what happened on Twitter".
But the worst offenders in terms of toxicity aren't journos. They are ... well, tormented human beings who love to dish out some misery to everyone around. Usually under a superficial veneer of a respectable goal.
So long and thanks for all the tweets, but I am not coming back. After leaving Facebook in July 2019, I felt almost liberated; I expect the same to happen now.
But anyway, re: your comment on the worst offenders, a related quote that came across my twitter this weekend-
"The surest way to work up a crusade in favor of some good cause is to promise people they will have a chance of maltreating someone. To be able to destroy with good conscience - this is the height of psychological luxury, the most delicious of moral treats" - Aldous Huxley
https://cpj.org/2020/12/in-2020-u-s-journalists-faced-unprec...
Elon Musk does this as well, just without any pretense of subtlety.
Teenagers spend 1000x the amount of time on Twitter - their "voice" is amplified.
There's another clade of credentialed or 'pedigreed' professionals, such as activist or non-profit people, 'community management' people, professors, journalists, etc. who seem to have some function in legitimizing and mainstreaming the drama of the day, possibly creating rationalizations for why it's good along the way.
I'm sure Twitter, internally, is already aware of these dynamics. But it would probably help the sociology of it out a lot if that information was more well known.