Yeah, if anything, not believing something exists is only going to make it easier to ignore.
Some things to keep in mind, vis a vis the Masquerade:
1. Most supernatural creatures have some way of appearing human, or at least human enough to get by on a first glance. Even ghouls have a flesh mask that lets them wander around in broad daylight unmolested.
2. Most supernatural creatures operate at night. It's a lot easier to disbelieve you were attacked by a ghoul if you never got a good look at it.
3. Things like the fae mess with your head in a way that's easily explained away as, "They must have put something in my drink..."
4. Nobody else believes the supernatural is real, so, obviously you didn't see a ghoul, and your friends, relatives and coworkers will just think you're nuts if you said you did, so you might as well not bring it up.