How do you say "no me ralles" in english?
"no me ralles" is a typical spanish expression. The literal translation is "don't scratch me". We say that when one person are annoying to you and he are pissing you.

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Pregunta complicada como no te responda un nativo.... podrías decir "don't bother me" o "don't disturb me", que viene a ser un "no me molestes" xD.

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The best way to say it is "leave me alone."
If you say "don't disturb me" it will sound weird and they might laugh at you.
Especially if they are already annoying and rude to you.

If you use slang like "piss off" that could lead to a fight.
Unless you want to give him or her the beat down of their life.
Here in America we call that street justice.