I have unsubscribed from a few progessive sites because they use bernie for fund raising, giving many of the reasons you stated. Tom Pérez has also heard from me.
Bernie a lifelong independent used and abused the Democrat party. He joined so he could use the party’s organization. When he stated to lose he complained about the rules that he agreed to when he joined.
Susan Sarandon said what she liked about bernie was his lack of ego. When bernie continued to ran when it became evident he was not going to win the nomination and was helping Trump win, Sarandon shugged said well the revolution will come sooner.
As Sarandon sits in her ivory tower I wonder if she aware of the suffering Trump has caused already in his brief 100 days.