They booed Bernie himself. This isn't about Bernie the man. His name is just a lost cause emblem for the angry green party/college protestor/communist-anarchist-nihilist snowflake crowd to wave as they do what they've always done. We're noticing this year because even though they're usually a small amount of the party, Bernie recruited a bunch of them as his delegates and now they're here, and he created a lot more of them through his agitprop.
And because normally someone performing as poorly as Bernie would have conceded earlier. Hillary would have had way more delegates if Bernie had had some decency.
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