The term 'evangelical atheist' has become a shame-term used much in the way that people will also use words like shrill, hysterical, shrieking, etc., to describe any woman who isn't a twee, mimsy, fainting Victorian debutante and actually speaks her mind, however politely, rationally, reasonably and factually. These words are deliberately used to undermine what the person is saying, to make them feel ashamed of themselves, to try to censor them, and above all, to put off others from speaking out in a similar matter about similar things.
Shame-terms are used most when the person shamed is making a good point, or stating facts, that make the person doing the shaming feel uncomfortable. ie Talking about the abuse of women in porn, say, or pointing out that it is offensive and wrong to presumptively claim morality is linked with religion (which is a very common mistake people make).
So when someone uses a shame-term, it does, at least, serve a decent purpose in letting you know you're hitting the nail on the head.
frustratedandfailing, you are right about not lumping all Christian together, I agree, but unfortunately, you've highlighted an error that Christians always make when appealing to others not to judge them as one generic faith group: describing certain Christian beliefs as 'bonkers' or whatever, and others as more reasonable. To an Atheist, believing in God, full stop, is just as bonkers as believing in creationism. There's no hierarchy of how 'bonkers' a belief is to Atheists, when it involves the supernatural. Believing in God, to me, is as bonkers as being a Scientologist, believing in the Tooth Fairy, believing in alien abduction, believing that a tiny chocolate pig called Henry made the Earth by farting wellies out of his ears. This is why religion doesn't appeal to non-believers. It all seems so ludicrous.
And then certain things like love, peace and tolerance are claimed as specifically Christian messages - as though anyone of any other belief, or lack of belief, doesn't manage to feel, embody and support those beliefs perfectly well without an ounce of Christian input! It's so offensive, never mind so ridiculous to say these are Christian things. Especially when Christianity has been the basis for more hatred, intolerance, violence and war than any other belief/non-belief system in the history of mankind!