“Trumpism is not going to be defeated by inside-the-Beltway politicians,” he said.
Ascribing malice to Bernie is a very dubious (read: wrong) claim, but unfortunately in terms of results that’s basically what’s happening. Working within the two-party system is never going to produce material results.
Then you should look up footage of how Bernie treats people to his left, and attacks activists for asking him why he’s not keeping his promises.
There’s video of him accusing progressive activists calling him out as being paid protestors, but I’m having trouble finding it again. But he’s long been aggressive at dismissing anyone to his left, while defending Democrats to his right. Maybe he held the torch for progressives post-Reagan, but his time and his usefulness have long passed. He does more harm than good now.
https://www.codepink.org/arrested_11_activists_arrested_at_bernie_sanders_sit_in_for_peace