In my opinion, regarding being PC and people being offended, not just in this manner but in society in general is this......The constitution does not guaruntee people to go thru thier entire lives without being offended!
It may be one thing to go around dropping the f bomb and being vulger, but if in everyday ordinary talk you happen to offend somebody...it is much more THIER problem than yours. But sadly in this day and age such is not the case.