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It was the purpose to propose the rude one.

I thought about it, ut for me it is not that rude.

So, both пока and привет can be used as a rude bye? What would be the best "rude" bye in an e-mail - without wanting to say прощай...[/quote]

Бывай!

in the speech it can be also sarcastic -...

I meant this too.

And not only this.
Если незнакомому человеку сказать "пока", это можно назвать фамильярностью и не редко грубостью.

Isn't 'пока' considered to be a bit rude? Or at least too informal unless you know the person well?[/quote]
a bit too informal - yes.
Not so rude though. But you can't say poka to your boss. It's...