Wow! A big conspiracy!
Just like chemtrails!
And the Bilderberg group!
And the Illuminati!
And HAARP, of course, which is radiating unknown mind-controlling radiation upon us!
your logical fallacy is ad hominem:
You attacked your opponent’s character or personal traits in an attempt to undermine their argument.
Ad hominem attacks can take the form of overtly attacking somebody, or more subtly casting doubt on their character or personal attributes as a way to discredit their argument. The result of an ad hom attack can be to undermine someone’s case without actually having to engage with it.
Example: After Sally presents an eloquent and compelling case for a more equitable taxation system, Sam asks the audience whether we should believe anything from a woman who isn’t married, was once arrested, and smells a bit weird.