I'm not so sure Boxer did a great job calming the waters...and I quote:
Boxer said "We need civility in the Democratic Party. Civility. Because the whole future of the country is at stake, that when you boo me you're booing Bernie Sanders. Go ahead. Bernie is my friend. You want to boo Bernie, boo me. Go on, you're booing Bernie. You're booing Bernie. Let's hear it for Hillary Clinton!"
"We have the votes, we have the voice, we have victory! Yay!" She said, as the crowd continued to boo. "I'm for all of us. Keep on booing and boo yourselves out of this election."
I guess some Bernie supporters were denied Delegate Status.