My dude, there are plenty of actual automated bots on Reddit. IIRC when Reddit cracked down hard on bot accounts recently, over half of users and participation in many subreddits also decreased. That alone says that there is artificial engagement on Reddit rather than genuine human interaction (which vindicates the dead Internet theory). It explains a lot as to why a very innocent and neutral comment somehow gets a downvote: they are just bots downvoting.

Even here in Lemmy, there are downvotes on the same benign comments and no explanation as to why someone would disagree. But even if the comment is political in nature, there are downvotes but no feedback as to why one would disagree. There is a post on c/climate on European Greens calling for Jill Stein not to run for US presidential elections because she would just siphon the votes from liberals and progressives even though she will not win. And many comments on that post are getting half or a third of downvotes, but there are no accompanying disagreeing comments to explain the disagreement. It is clear that there are bots in that post who are trying to downplay the repercussions of Stein running to US elections and democracy.