Back in our times a 600.000$ sell would bring bitcoin down to almost worthless. Today? Not even noticed 
Not that I doubt you but I definitely noticed the 600k dump.
What Gabi meant is that there was a time when an 18k BTC dump would have taken weeks to recover from... even last September.
No, I get it.
I'm just saying that "not even noticed" is a bit of hyperbole.
I noticed, but I'm not worried.