The public square is still right there. Go tweet, it’s the same as ever.
If I needed Twitter for anything, I'd have registered and blocked the stench. But it's easier to just pass by and laugh at the antics from afar.
That's what public squares have always been.
And lest somebody overinterprets this analogy: I don't doubt that some groups are using Twitter just fine and don't care about the brouhaha.
You can filter it out in your own Twitter by following people you like.
Some of the things you don’t tolerate are benign to others. And some of the things you like are cancerous to others.