You will be called out and booted.

Copycat handle example

Real user: FecalFace
Fake user: FetalFace

Anyone trying to imitate another handle through similar-yet-different spelled username will be banned, along with your regular handle as well.

Very simple. Use one handle, be respectful of others varying opinions and you're good. But create stupidity, act like a jackass, attack others, or create a bunch of aliases, then you can look forward to the boot.