The Platonic element of error and why anti-Catholicism exists at all!

I got into another Easter quarrel with a reprobate about The Church, and I came to a startling realization on the very nature of anti-Catholic lies and hatred, and why they are so popular among ALL groups.  Sure it’s demonic, but demons have no control over man and can only manipulate.  To be manipulated, someone has to already be weak, and so what is that already-existing weakness that demons exploit?