Bernie is unique in that he is expected to be responsible for the actions of anyone claiming to vote for him while the rest of the candidates are barely even held responsible for their own actions or past actions.

— Big McLargeHuge (@PrettyBadLefty) February 16, 2020

All part of the propaganda push. You’ll see much more of this. They’re just angry they can’t tar him with the antisemitism charge as they did with Corbyn since Bernie is actually Jewish. They might try anyway, though.