I guess I don't understand completely Lemmy, because some lib is calling me a Russian troll under this comment and I can't see it unless I go to the original/non-hexbear post

I think that was common on Reddit, too.

It usually means they replied and blocked you, or deleted their comment later. (Or it got deleted by a mod)

It's people who have the mentality that the last word wins the argument, especially since anyone else who reads the comment chain would think you had nothing to say in response.