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.