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Don't dress in leather, have a knife strapped to your thigh, cut yourself, etc.
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Don't say non-metal bands are metal
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You can listen to any genre of metal you want and still be a metalhead
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Listen to old and new bands
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Do not call bands "poser metal"
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Never stop looking for new bands
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Have respect for other's opinions
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Don't let metal be your only priority
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Understand that there's no such thing as real music and that all music is subjective
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You can like other genres of rock too
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Know the differences between metal genres
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Don't be a metalhead just to look cool
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Study metal history
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Don't brag about being metal
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Don't say it saved your life