I don't like the way Biden handled that, but he basically just said he isn't changing his mind and the guy should vote elsewhere if he doesn't like it either. Isn't that kind of cranky, no compromise exactly what Bernie does? I'm pretty sure if you asked Bernie if he liked pumpkin pie he could find a way to talk about Medicare for All.
Not a graceful handling of that situation. I don't think we have to crucify him though.