As with all controversial opinions and viewpoints, the holders thereof can be divided into 'Generally Passive' and 'Generally Militant'.

A passive sort doesn't especially care and takes no great pains to diminish those who hold a contrary view.

Someone who is militant in their beliefs will be inclined to belittle, in thought and/or deed, those with opposing positions.

Personally, I only fault passive atheists for their lack of curiosity towards the information that challenges their position.

I am profoundly distrustful of the militant variety. FAR too often there is more to their militancy than simple disagreement over the available facts. TOO often it involves the perpetuation and propogation of CRUEL depravities in personal conduct and socio-political constructs.