Brand problem and anonymity mismatch.
Plenty of people hate brands. Microsoft, Ford, Chevy, Walmart, Green Bay Packers. You try to turn yourself into a brand, you're going to pick up hate because you're a brand not because you're a person and hating brands is culturally seen as a great idea that should be emulated as much as possible. So trying to fix hatred toward humans is pretty much a waste of time when the root problem is hatred directed at brands. Even if they are "personal" brands. Or rephrased whatever is done to fix this (if anything) the blowback will eliminate brand hatred (umm, good luck with that BTW). No more hating some random female programmer or journalist means no more hating walmart or ISIS or the Jews or Obama (oh wait Obama is a dude not a brand, well, he is both, whatever).
The other aspect is anonymity mismatch where semi-anonymous people are attacking very non-anonymous victims. The solution proposed over and over is less anonymity for attackers. Removal of identity from the victims would work just as well. This merges in with "personal brands" paragraph above. If supposedly you truly want to promote a message and not a brand, that brand being yourself of course, you'd do it for the cause and not the fame. Unless you really are promoting yourself as a brand using a message as a tool to gain fame, and unfortunately gains attacks.
Combine the two concepts and a "famous" non-anonymous brand, which happens to be an individual, will get a heaping dose of trolling for deep seated cultural reasons related to what it means to be a brand and what it means to be famous (and not famous). Good luck fixing that by getting distracted by "brands are people too" and "be nice to people", its the wrong tactic to fix it. You're trying to install deck screws with a hammer.