How to handle zero voting in 3 easy steps:
1. Do nothing.
You guessed it, there are no more steps.
The best possible way to discourage zero voters is to say nothing. Don't zero them back, make a thread, PM them, or PM the admins. There is absolutely nothing you can do about it, so just sit tight and let it slide. Yes, they probably are a bunch of 13 year olds (or younger) who just want attention. But they're just 13 year olds! It's not that big a deal! All they want is to get noticed, and when you start yelling about it and showing their anger, they just giggle and zero more songs. Imagine the feeling, infuriating a bunch of kids 5 years older than you! What fun! In fact, maybe I'll go and zero some songs myself! Maybe I'll get a thread made about me! OH JOY!
-A thirteen year old.