I don't block people out of principle, even if they're trying to attack my character simply because I critiqued some creative writing of theirs that gave me, a reader of their work, a mixed-message. When someone goes out of their way to attack your character repeatedly, across multiple channels, and never deigns to explain their arguments, it's simply counter-productive and harms discussion. That type of shutting down of debates, of silencing opposing voices instead of responding in a polite, measured fashion, is the modus operandi of the Conservatives. Instead of explain themselves, they lash out and try to nitpick petty fights.
If you want to learn to recognize psyops and propaganda, you need to not only learn how to ask questions and think critically, but also analyze the words you're reading. Is it trying to imply something? Is it contradicting itself? Is it trying to sell me on an ideal instead of facts? Propaganda is a tool used by everyone, left and right, to influence the masses. We can't afford to allow propaganda to give us a false sense of security. You can't rely on belief. Even memes are often propaganda, whether its to garner favor for your favorite show, or bash some game, it's all trying to pull opinion.
Ask the questions, call out the things that are contradictory, challenge things. If you aren't able to defend your words, you stand on shaky ground and need to go back to the drawing board. If you can defend your words, perhaps it was a misunderstanding, or, you've just educated the person challenging you, or educated yourself. That is how you counter psyops, and that is how refine your own work.