Never call other humans disbelievers!

[Mystic]

You can call yourselves, that, but I won't, because as a Muslim, disbeliever has a context and special meaning, and I won't apply it to you.

You should, dumbass.  Either words have meaning or they don't.

Quran never meant it in "disbelief (in Islam as soon as he hears from some random person)" for example.  It clarified the context of the word. We can't just apply what we imagine it to be but have to see what Quran clarifies what it means by it's own terms.

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I prefer to be called Infidel.  It makes me feel all warm inside.

You can call yourself that, I won't.