I get where this meme is coming from, but I think it's a bad idea to remove a person's credibility if they believe in a thing that I consider supernatural/bullshit/pseudoscience/charlatanesque.

Firstly: a supernatural phenomenon today could be a scientific field tomorrow. Any sufficiently advanced technology is indistinguishable from magic.

Secondly: They could simply be ill-informed about the state of knowledge about that subject, or they had a very bizarre experience that they don't know how to explain otherwise, or they never thought too much about it.

They do lose credibility to me when I present facts and arguments as to why I believe it to be false, and they fail to show they can have a rational debate to explain why they think I should change my mind or understand that they could be in the wrong and acknowledge it.