You can't disprove those things. People who believe in ghosts or fairies or angels or gods always beliefs plus claims of evidence. You can disprove some part of the evidence, but they'll always have another bit of evidence where there's not enough data to prove anything one way or the other.
It's the same deal with space aliens visiting Earth. The evidentiary basis for that is no stronger than that for aliens. You're correct that it's preference that leads some to favor aliens over angels, etc. But that's all it is.
so they'll believe them. You can disprove/prove it but you just won't convince them: the certainters on either side. The situation you describe is different to proof, it's more subjective, more to do with resistance.
It's an exact mirror of the practice you see of people who don't want to believe in aliens visiting Earth, inventing new ways to avoid the evidence, whether it's sensor data, witnesses whatever.
"The evidentiary basis for that (fairies and ghosts) is no stronger than that for aliens."
That's an objective sounding statement, but it's just your interpretation and preference. By what standard? If we had hundreds of thousands of people around the world saying they'd been raped / kidnapped by a gang of roaming miscreants dressed up as pirates, and these people had missing time, missing clothes, and then we had the EU maritime agency come out and say, "We've captured what seem to be swarms of pirate ships on radar". Would you still not believe them?
It's the same deal with space aliens visiting Earth. The evidentiary basis for that is no stronger than that for aliens. You're correct that it's preference that leads some to favor aliens over angels, etc. But that's all it is.