That friend and colleague responded to the question in the form of an example. Consider the word "evangelization." To the ears of Christians, the term is rooted in Jesus' call for his disciples to bring the gospel to the ends of the earth, making of it a religious duty. Parents evangelize their children. Christians evangelize other Christians who have grown lax or non-Christians in the hopes that they will love the gospel. However, the term has been interpreted historically to mean everything from a "soft sell" to "forced conversion." Most likely, neither extreme is what Jesus had in mind.
The term "evangelization," The Motley Monk was informed, is what, in Arabic, the "jihad" connotes in its "middle" sense. For the overwhelming majority of Muslims, when that term is invoked in the public square and public airspace to identify the brutal and immoral conduct of all Muslims, this use of the term is offensive, just as it would be to the overwhelming majority of Christians to hear the term evangelization limited to an extremist group of Christians (like those who murder abortionists) but then applied to describe the entire Body of Christ.
Should Christians use that word knowing how and why they offending a great number of Muslims? No.
Another example the came to The Motley Monk's mind is the use of the Holy Name.
To the ears of faithful Jews, when Christians invoke the word "Yahweh," it is deeply offensive, as Jewish law prohibits the faithful from either speaking or writing the Holy Name. For example, The Motley Monk has received notes, letters, and emails from faithful Jews and, when they must use the Holy Name to make the point, most frequently they render it "G*d." Yet, Christian congregations feel entirely free to invoke the Holy Name routinely, for example, when they sing "Yahweh, I know You are near."
Should those congregations sing a song knowing they are offending a great number of Jews? And, if they don't know, trained liturgists who are selecting that song surely should know, shouldn't they?
Being "sensitive" to how others hear what one is saying is important in a pluralistic society. So also is not extrapolating to the majority what a tiny minority believes/says/does, as Raza implies by the numbers.
That's not being "PC," but being a respectful and mature person...just like a spouse who knows what not to say and when not to say it.
Let the discussion begin...
* - A "Tip of the Hat" to Second City for the lead.