It's been so for a long time amongst casual twitter. I'd say celebrities shitslinging at each otherin public became more common place around the pandemic though. No, Elon's purchase and unbanning of fascists did not help at all.
My experience was that most of the garbage was hidden below the 'show more replies' section and the higher quality replies were more likely to be at the top (not always, but mostly).
The whole thing with 'verification' and those posts being prioritised flipped that on its head, to the point where I couldn't stand using it any-more (this was two years ago).