I'm a Christian, the opposite happens as well. Why can't we discuss our beliefs in a civilized manner? I will never tell my "pastor" about an atheist or theist in my area. Especially considering I have atheist friends.
I don't need to discuss your beliefs for the same reason I don't need to discuss the beliefs of the schizophrenic man that stands outside my building, clad in a blanket, shouting at the sky.