Considering a single tweet can raise or lower stock prices by multiple %, yes.

I would take it even further, though: the whole monetary system is becoming increasingly abstract and - in a way - meaningless.
Long gone are the days where the banknote you are holding represented an actual piece of something valuable in some vault.
Nowadays, the money you are using isn’t even backed by a banknote.
You cannot even pull a Count of Monte Cristo on a bank anymore, but they have secured themselves against such action anyhow.
Multiplying money is a fact that has its own rules and regulations.

And so on. This was bad even before digital currencies (let me point to a short story by Michael Ende: Die Bahnhofskathedrale) and has gotten orders of magnitude worse.

So yeah, stock market bad. And it’s as old as the whole financial system described above, and an almost indistinguishable part of it.

I’d be glad if we could roll back the clock on all this, but I fear that madness is here to stay. Until some sort of collapse. Hopefully only a financial one.