I will ask once again: what about the word "shitlibs" do you have a problem with?
If you're actually a leftist, then certainly you should have no issues with a fellow leftist using a pejorative term for liberals to describe liberals, right? Because as a leftist, you are not a liberal, since liberals do not oppose capitalism, and you are likely frustrated with how liberal monoculture dominates all political discussions, right? And it's not as if "shitlib" is a term of bigotry. Like I'm just taking the self-identified label of one faction of the capitalist enemy and adding the word "shit" to it.