I'm torn. If you're taking this personally, and decide not to help liberals anymore because of this, then yeah, you were never a real ally. I also agree that these people do need to do some self reflection if they're so ready to dip at the first sign of criticism.
At the same time though, should I really give a shit if someone is a real ally or not if they still come out an vote against republicans? As much as people shouldn't take a statement like this personally if it isn't referring to them, I don't think it changes the fact that people some people still are going to take something like this the wrong way. I get this is pretty much the definition of white fragility, but I don't want to go through another election where we lose because people don't show up. I have no intention of backing down from the fight because of criticism, but I don't know if I can say the same for everyone else.
If this reads like it's coming from a place of privilege, I apologize.