I don't think you're being autistic. My opinion is that the commenter was being a little overly sensitive but also vulnerable, and that Rebecca took it as a personal attack and responded accordingly. Others piled on instead of trying to unpack the miscommunication. The internet sucks sometimes

It is possible that he didn't mute you for criticizing Nosferatu but because he may have felt that your response to his pushback was an escalation in personal hostility. (E.g, 'single brain cell take'). Particularly in the context of his pushback being (his opinion) that you were being harsh.