There's a big fucking difference between expressing this kind of sentiment before the primaries, when it has the possible outcome of changing the nominee from a neoliberal to a progressive or leftist, and expressing it after the primaries, when the only possible outcome is discouraging turnout for Democrats generally and thus helping the pro-genocide fascists.
By all means, yell from the hilltops about AIPAC-tained candidates etc. during the primary. That's a good thing! But once the primary is over, it's time to STFU about it if the nominee isn't your preferred candidate because at that point there is no longer any better alternative.