Unpopular opinion:
Alienating liberals doesn't create more leftists, it only causes people to be dismissive of the term and dig in their heels.
Insulting them rather than educating them does nothing but divide anyone left of center and after the last election I think it's abundantly clear that we need to be unified rather than divided.
No one is going to argue that left leaning candidates aren't far from perfect, but they're a hell of a lot better than the far-right fascists were about to have in power in less than 2 weeks.
Yes, I agree modern liberals are too centrist and ineffective but at the end of the day they're light-years ahead of the far right, and I'd rather be agitated about having another centrist administration than alarmed and outraged at the onset of fascism.