I won't address the fact that not all of us are horrible.
Anyway, Warren vs. Sanders would be a tough race to predict, since they'd attract a very similar contingency, and I'm not positive who Clinton's supporters would be backing (more would probably be backing Warren, just a guess.) Still, just about any long, drawn-out primary brings out the worst in both sides, and I'm pretty sure no matter who Sanders' opponent was, we'd see some awful Sanders supporters. The 2008 election was the first one I could vote in, and I can tell you, it was much nastier than this one, even though Obama and Clinton are ideologically even more similar than Sanders and Clinton.