A theist addresses a comment or situation with a religious statement. This is an expression of their views.
An atheist addresses a religious comment or action with a statement criticizing religion. This is an expression of their views.
One is entitled to their beliefs and should be respected as well as allowed to voice their thoughts openly, as is their right. The other is a bully and should remain silent as everyone is entitled to their own opinion, except apparently, theirs.
An open stance against religion is viewed as an intolerant attack while an open display of religious perspective is a sacred act, beyond reproach and exempt from criticism and challenge.
I may not agree with your views, but I fully stand behind your right to have them and even voice them. However, if you don't want me to openly express my opinion regarding religion, don't openly express yours. Freedom of speech is not a one-sided privilege, only entitled to those who's convictions are vulnerable to injured feelings. You have the right to hold your beliefs and speak your mind. You don't have the right to not be offended. You don't like being challenged in an open exchange, take your ball and go home. Me, I'm staying right here and exercising my right to free speech, whether it hurts your feelings or not.