Pretty sure OP is talking about people like me, who aren't just going to automatically vote for the democratic nominee simply because they are the democratic nominee and instead decide to hold even democrats to a standard, and one that senile racists like Joe Biden can't meet.
Telling people like me to "shut the fuck up and vote" isn't even close to the worst that OP and others have said, either. I've literally been called a white supremacist sympathizer on this forum for saying I will not automatically vote for Biden, in part because he's a massive racist who courted other racists to stop segregation and then lied about marching for civil rights and authored a massively racist crime bill that has devastated the black community for the past 25 years. I've also been told I don't care about the LGBTQ+ community, or any minorities, and that I'm a selfish privileged asshole etc. blah blah a bloooo
I guess they think it's an effective strategy (and they'll try it again in response to this post I am sure). It isn't, but nothing I say is going to convince them otherwise so I don't even try discussing the issue anymore. I'm done choosing between the lesser of two increasingly evil options, as far as I'm concerned the logic on display in the OP is exactly how we ended up having to choose between two of the worst possible candidates in history in 2016, and a bunch of random people calling me names on the internet isn't going to change that. IMO we need actual change, we need to hold the left to higher standards than Diamond Joe fucking Biden. I'm done with "vote for me because I'm all you've fucking got" logic.
For the record I will gladly vote for either Warren or Sanders, and in the unlikely event that Buttigieg is the nominee I'll grit my teeth and vote for him, too. Maybe my math would change if I lived in a state that wasn't pretty solidly blue, but I doubt it.