So yeah, I wouldn't exactly call that process fair or equal, although it was fun watching Bloomberg spend a shit load of money only to discover that nobody liked him.
A lot is made of Biden's support from Black voters, which is true, but it's rarely mentioned that Sanders had strong support from younger Black voters and he was typically the second choice of Biden supporters as well, perhaps pragmatically.
There was much less acrimony between those camps than was made out to be.