To be honest I get sick of the stereotype "atheists=arseholes", yes some are, some have no regrets being dicks towards religious folks or being generally dismissive, but it's silly when in my head I'm thinking of how I might alter a person's expectation of me, if I say I'm an atheist, would that somehow be provocative? Or would I have to use a modifier, "I'm an atheist, but I'm not intolerant of religious people", which is ridiculous think to think. Outside of the internet, here in the UK, it's not so bad really, nobody's going to care if I say, "I'm an atheist", at least most of the time. Heck, I might say, "I'm an atheist agnostic Buddhist", that one gives puzzled looks. At least it means I can justify it to them or just amuse myself in the fact they're extremely confused.
However, I know people who would prefer to refer themselves as agnostic, as to know come off as a provocative, but 'atheism' ISN'T provocative. An example, my mum said to me, "I'm not an atheist", so I asked her, "do you believe in the existence of any gods?" to which she replied, "no" and I said, "you're an atheist". Done that one to friends as well. You don't have to be an arsehole to be an atheist. But if you want to be an arsehole, well, it's your own perogative.