Guess what? Other forms of organizing and protest will also be opposed. And we should still do them.
If a movement is real and serious that organizing to vote in primaries is really not a big deal. Blue no matter who is really just a last resort and if you don’t want to then you should at least spoil your ballot.
PS anything you consider more effective than voting can still be done btw. Change is not an all or nothing (tho given the mindset around many here they should not be surprised when they really do keep getting nothing)
The importance of spreading socialist theory is so that people correctly understand the problems of today, and that a solution is possible. Contrary to what you imply, I believe that the working class is fully capable of grasping what it needs to. I agree that there is power in numbers, which is why the task of a worker party is to align the working class in the same direction, and develop the class consciousness of the whole working class.
Organization is part of the end goal, but we cannot lose sight of the necessity of revolution and establishing socialism. Organizing is hard work, and to not study theory and history only makes it that much harder.