What am I missing here?

Either pro-social instincts, a sense of what is appropriate or common courtesy. There just isn't any call to throw out completely off-topic insults like that.

And no I'm not going to be baited into any Quantum Mechanics debate here. That conversation doesn't belong on this page and this is undesirable, anti-social and mind-killing behavior completely independently of whether you happen to be correct.

Appending one's opponents to a list of religious people completely outside of any relevant context just isn't acceptable behavior.