Made curious by some of the other comments here connecting that Redditor's abusive language and refusal to really say anything of substance beyond 'I don't like this' and Maoism, I just spent kind of a long time looking back through that person's comments trying to figure out what about their thinking is particularly Maoist, especially in the context of that series of insults they wrote on your post, which don't, to me, reveal any particular way of thinking so much as a temperament.
I did eventually find some Maoist language across their comments. They probably do self-identify as a Maoist or Marxist-Leninist-Maoist, though I didn't see a comment to that effect.
But what I noticed more was that pretty much their only mode of discussion was verbal combat, and maybe in some cases declarations on certain questions or definitions of terms. There wasn't a lot I could recognize as instruction, exploration, or listening, although I imagine they'd consider some of their declarations educational.
I'm tired. I can't think. I don't have a thesis here. But OP, I'm sorry that someone took it upon themselves to shit on your work instead of offering you feedback or simply saying nothing.
Let him know that you think those anti-communist materials are wrong or misleading. Offer to explore some of these topics in depth with him in some format(s) that's agreeable to both of you (video, books, podcasts, whatever). Let him pick some sources, and you pick some sources, and then you both discuss them together.
Most people who are anti-communist are reflexively so, and have simply never heard a lot of key history. Just studying/exploring/discussing communism and its history can undo a lot of that.
As tempting as it might be, you don't have to go through everything in the propaganda they've sent you sentence by sentence and then debunk it. Just have a conversation with them about it and take a look at the real stuff together.