Does it? Has everyone who ever heard the Gospel been offended by it? What do you mean by "offended"?
Excellent questions... (I like your approach on this thread, btw.)
I guess what I meant by "offended" is that often the Gospels tell us something that runs counter to our own beliefs and behavior. In response we become defensive in some way; we might try to argue past the difference, and can offer all sorts of good reasons for why our case is different, and the Gospels really don't apply.
That defensiveness takes any number of outward forms -- whether it be anger, apathy, or branching off to form a new religion. But in any case, we're at odds with the Gospel -- it "offends" us.
Is everybody who hears the Gospel offended by it? No, of course not. Should they be? Probably.