Uh-oh!
My mother was there, and this is how white str8 male organizers essentially behaved during the antiwar movement when Bernie came of age. Women shut up, black people were ancillary, the gays were beneath concern - it was always about the passionate, virile white guy with the megaphone who, if you really understood his rap, would sleep with you.
That paradigm has not changed much on the far left for fifty years. When it began to in 2008 and a black guy took over the party and didn't listen to them, most of the latest generation of passionate white guys (Matt Taibbi, Greenwald, Scahill, etc.) proceeded to lose their fuckíng minds. Then, they began to do what a lot of their predecessors had done in the 70s and 80s - drift towards the enclaves of the right or right-adjacent or at least sympathetic, spaces where their voices are still heard first and loudest. The history of our ego is cyclical.
Now, is Bernie those guys? Not exactly. I believe he means well. I also believe he's ultimately very privileged and self-absorbed. Take away a microphone and funds from him now, after he's had more than he dreamed, and I will wager $100 he will be on Fox in five years.