This is wrong. Firstly it misrepresents atheism, secondly because the generalization. Maybe a minority of atheists, extreme ones, would mock - but not all atheists will. Understand: the fact is there is nothing to support atheism, nor has any argument or reasoning presented by it stood the test of time. So it's nothing, and pointless to argue, or debate, or mock someone for doing, when we can be focusing on finding the truth instead, and living as civilized beings.