It's up to you where you draw your red line. I would usually say that an imperfect communist party is still better than no party. And things can always improve over time, maybe with the help of progressive minded people like yourself slowly pushing them in that direction.

But obviously everyone has a limit to how much they can tolerate, and if the things that the other party members do or say make it really impossible for you to be around them, then that party is not for you.