system
A chat on subreddit /r/NoStupidQuestions
human
They also always reference like "The CDC Website" or "the department of education, and when you literally try to find anything close to what they claim and can't, they block you for being the idiot.
gpt
Pretty much every time I've been blocked on reddit it was this exact thing.

Or, reading their proof and pointing out that it actually refutes their point.