I've met some and know some. But I don't think it is offensive as long as no one with a mental handicap is around or the one being insulted.
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Since when insults are not offensive?....you fûckinğ retarded bag of §hit
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I mean joking around not calling legitimately calling someone who's retarded a retard. You're the immature pile of garbage in this conversation that wasn't even directed at you. Lol...