IMO what is happening are disinformation bots trying to discourage people from voting.
It was first that you should stay home and not vote, because Democrats put an “old geezer who is not aware what is happening around him”, now the same bots will be saying how Democrats were cheated by deciding their candidate without input of the voters, trying to replicate the upset that was over Bernie in 2016.
IMO I think Biden was excellent at governing, and no one will be as good as him when taking with foreign leaders, as he knew them all and had a good relation with them.
Having said that I will be voting for whomever Democrats put up (Kamala or anyone). I already got fooled to vote 3rd party in 2016 and won’t make the same mistake.