When Biden beat Bernie it sucked, but the other candidates dropped out and put their weight behind Biden so it allowed him to get the most votes. That's not anti democratic, just strategy.
I'd say this go round will be much less democratic if Biden drops out, because registered Democrats more or less all voted for Biden and then all these party insider delegates will actually be the ones picking the candidate.
Don't get me wrong, I will still vote and advocate for pretty much anyone over Trump, but the Democratic party is not covering themselves in glory here.
In my ideal system we'd have ranked choice voting, so many people can run without risking being a "spoiler". If an individual doesn't have enough votes to get a majority, those votes will move on to the voter's second choice, then third choice and so on until someone has a majority of support.