You have to pick:

Everyone talks like an evil gnome and all sounds sound like they went through a creepy, evil echo filter

What do you mean creepy?
does everything you hear sound like terrifyingly creepy?
or is it just some things in particular?

Solution: Pose as your identical twin. Yeah it would make that statement true, but who gives a rats

Everything.

If everything sounded creepy, you'd get used to it, and it would no longer sound creepy.