I think this is actually a total inversion of what happens.
I don't think I've ever seen anyone here say people need to agree with everything KJK says or does. In fact, I have never seen anyone say that they personally agree with everything she says or does.
What they say is that there is no need to agree with everything she says or does, it should not be expected. And most importantly, this idea of "aligning" and association tainting people is a serious problem, not something to be catered to.
It seems like a certain section of the progressive left can't understand this idea. They are totally convinced that any interaction with others that somehow taints them is a big deal. There is a real inability to see that others, like conservatives, don't hold their views because they are hateful, evil, or stupid - which largely seems to come out of an inability or unwillingness to understand arguments from "the other side."
And then they argue that because some people think this way, it's necessary to cater to their thinking or the will just dismiss the GC movement.
These are the people who think everyone needs to agree about what counts as a progressive cause. It's their problem, and its a completely politically unworkable approach. It can only end in failure when others start to ignore them, or left-authoritarianism.