First of all, I have no idea what P.C. is? I pretty much get what you're asking though. I voted I speak my beliefs. Now that doesnt mean I'll make people uncomfortable or press any of my beliefs. I've never been in a situation where my beliefs such as believing in God or anything like that have offended or upset others. I have a few friends who believe differently, but we've always discussed our different beliefs very frequently and never any problems.
Now there's no way in heck I'd pretend I'm someone I'm not or pretend I'm not a believer in Christ just to keep from upsetting someone. If my beliefs upset a person then that is their very own problem. My voicing my beliefs and only that is my very own right. I don't preach to people and I don't care at all if others don't believe like me, but I don't like being belittled or cussed out when I say I believe in God. It's never happened except for online though.
I have been bashed (badly) in situations like when a person tries forcing things like porn on my partner and I. We've had situations where it was done and when I told the person to stop forcing it in my face and they were'nt to be back in my car, I've been bashed and talked to like crap. I don't think any less of a person for their beliefs and I don't mind if they voice them as long as it's not in some sort of hateful way or pressing it on me. I get along with just about anybody so I certainly wouldn't let different beliefs stand in my way of a friendship.
I understand keeping quiet and not constantly speaking about it in front of someone who are uncomfortable with it. I do hate when people have nothing but judgmental crap to say the entire time they're around me though. I wouldn't ever tell someone they're living their lives wrong just to feel superior and I hate when someone claims to be a believer in Christ but doesn't accept others who are different. I also can't stand a 'christian' who's boastful, proud, arrogant and thinks they're holier than thou. That actually is not what Christianity is. Now if I'm around a person who's like that and they insist on doing me or my loved ones that way then I might ask them to leave or shut up. Lol. No sense in judging or telling others how to live.