I don’t think celebrities and actual humans are quite the same. Celebrities have been putting on personas since the very first celebrities began. A celebrity is literally a public image, that’s what it is. This stretches to politicians as well. Hannah Montana was not an original idea, it was a commentary on the lives a lot of celebrities live. Tosh.0? A shy introvert.
The only thing you mentioned that was new is the invention of digital avatars. Everything else is business as usual. Who cares?
As for the people harassing people? Well they should stop. Online harassment isn’t cool, regardless of celebrity status.