They have been brainwashed to shut down whenever they hear that name, and refuse to hear any more. They cling to a debunked study saying Snopes is fake.

So, plagiarize. Read the Snopes article and pick out two or three facts that prove something is fake, and make those points in your own words. You can cite the same sources they do. That's usually enough to change minds, as long as they don't know where it came from.