I think what you perceive as intolerant and hateful is actually you being judgmental. I prefer to think of athiests as rational and kind loving people who have an alternate sense of community, and who react negatively to being judged by irrational standards.
I am being judgemental (I don't hold judging to be inherently wrong, I make judgements every day, "that car is fast", "Bitcoins are a good investment"), and based on my perception of this thread, as I originally said you get a very hateful athiesm:
Judging by this thread, athiests are the most intolerant, hateful, and irreverent types
That is, if you only had this thread as a representation for athiesm that would be a logical deduction.
I have not seen where I or others, really, have judged athiests by irrational standards on this thread. In fact the only judgement I've made wasn't really a judgement just a criticism of how athiests are behaving in particular this thread.
I'm not saying it's impossible for there to be a kind, loving, tolerant athiest, merely that such athiests are not common (at least from my experience).