Hillary couldn't be bothered by BLM at Netroots because she has stayed away from Netroots after being harassed there a few years ago. I don't know why they haven't been targeting Republicans unless they've just given up on them as hopeless causes.
Hillary hasn't been having the same kind of events Bernie has been having. Many people here have been criticizing her for her small fund raising lunches and dinners. Whatever you think of her fundraising, she's not going to run into protestors inside those events. And once she gets involved in larger events, the Secret Service will be there to keep protestors from getting too close.
Bernie should be reaching out to event organizers to see how they're planning on handling disruptions. This is nothing new, and they should have a plan.