How about the rudeness to the hundreds or thousands of people who went out of their way, and may have spent significant funds, to go there and hear Mr Sanders? The "activists" do not care, and will ruin it all so they "can be heard", as if they are not allowed to talk in other ways, or hold their own events. Disgusting, callous, and rude.
I don’t much care for these activist types. Their one trick is to be rude and obnoxious, hoping that some one will give them what the want. The problem is, when they find a patsy the bat signal goes up and the activists swarm in and the next thing you know they’re like the tribbles on Star Trek. This will not end well for the socialist from the People’s Republic of Vermont.