Do you consider those who voted "uncommitted" as a supporter of his?

I have no idea. I'm sure it's a mix. Why would what I consider matter? We need to be doing more than voting uncommitted in a primary-- there are people in prisons, people being deported to dangerous situations, people in Palestine dying, children starving to death, I've seen pictures and videos my god. If someone votes uncommitted but then turns around and lashes out at people for hurting his campaign by [checks notes] talking openly about atrocities he's actively committing then it doesn't matter if they're a supporter or not-- their opinion doesn’t count.

he's been avoiding public events from fear of protest

This is no surprise. Fascists tend to be massive cowards.

even his own "supporters" are sick of his bullshit

Disagree. His supporters are extremely cultlike. Check the modlog, and you'll find mods removing comments right here on "leftist" lemmy for saying Biden is committing genocide, when that's exactly what he's doing. Sending arms to a genocidal regime is committing genocide, like objectively. Go to practically any community except this one, and you'll find shitlords in the comments defending Biden because wOn'T sOmEoNe ThInK oF lE cAmPaIgN. And the only reason you don't find them here is I ban electoral shills and establishment liberals on sight so we can have a place to breathe.