That's not the real reason public opinion has shifted sharply against denizens of the Valley. That would be Uber. A company so sociopathic, so awful, so entitled, so full of loathsome self-aggrandising bullies they became an unwitting figurehead for hatred of the Valley. And Uber make it so easy to hate them.
The fact that Uber hasn't suffered any noticeable loss of business suggests that this is false. Or at least that it doesn't matter if people love you or not.
But my point is that Uber's reputation plumbing the abyssal depths, and to a lesser extent AirBnB's, is dragging down the reputation of the rest of the valley.