Holding your tongue, or taking a second to think about if your words might be offensive isnt necessarily a bad thing. Remember, we have freedom of speech, not freedom from repercussions caused by our speech.
I think its more that everyone is on edge about social and political issues and it is so easy to say something that can be deemed polarizing. Also, who goes out and discusses their beliefs with strangers or with folks you dont have a certain level of familiarity with where it wouldnt be impolite to discuss religion/politics/ or any other controversial issue?
Maybe this is a reflection of social media interactions, as opposed to the in-person interactions we all used to have?