For the moment (until I or someone else comes up with a more complete answer), here is something that might be of interest. Not so much a "how Maoism got in my anarchy?" but rather critique, but I find some of the critique helpful context, personally:
Against Identity Politics
Maoism in the United States and another article that may help you out. There are a lot of writings about Maoism appeal to leftists in the US that have similar titles. If you have access to something like jstor, there are a bunch of articles that discusses your question.