I hate other atheists.

I am an atheists, but other atheists, or at least the ones who make a big deal out of it, piss me off.

Your ability to choose is irrelevant.  Once again, knowledge and belief.  Two different things.

If you believe in god, then you're a theist.  If you don't believe in god, then you're an atheist.  Your belief may change, but you are always one or the other.  Never both, never neither.