Two things can be true at the same time.
But if you think the Reddit community is communist, I can only assume you have no idea what the word means besides having listened to Fox brand everyone they don't want you to like as communists.
Discussion
I can see why you would think that given the years of Fox labeling everything communist but Reddit has genuinely embraced it.
A large percentage of the comments on the popular subs have been along the lines of “eat the rich” and “capitalism is the worst thing to ever happen”. There’s even a bot that makes several front page posts on the bitcoin sub who self identifies as communist. It’s everywhere.
See, you're just proving my point because the only communist thing you mentioned was someone expressly identifying as communist. It's not a binary choice between communist or capitalist where if you're not one, you must therefore be the other. They're economic frameworks for how society should handle ownership of critical resources and infrastructure. Neither of dissatisfaction with the status quo or hatred for the extremely wealthy is part of communist ideology. Propaganda has completely robbed people of the capacity to even recognize the concept.