I've heard this brought up a lot. First of all, fuck Cuomo. Any rational person should be supporting Zohran over any of the other candidates.
But also, is there an actual worry about the ticket getting split or non-votes and allowing the Republican to win? That's essentially what "vote Blue" is about.
Also, progressives have one candidate that is obviously better than the alternative, even if they don't like both. Moderates aren't necessarily convinced. It's just a different argument.
Although, if they are and they still just don't like them, I'm 100% telling them to get off their ass and vote to stop the nazis.