Being somewhat of a newbie, I recently flagged someone's comment (excerpt: "How the hell do you expect...") on someone else's question because it belittled the OP, i.e. a reason I felt fit the criterion of Offensive with respect to flagging. Unsurprisingly (at least in light of this answer), the flag was quickly marked invalid (perhaps explained by this answer's Moderator Moderation subsection).
In hindsight, I agree that my flag was invalid according to the criteria laid out by more experienced users; however, it doesn't seem beneficial for SO (specifically, for new users' sense of SO's community) that its moderators only be concerned with extreme cases of offensive language. Of the many types of "mild" offense, this particular type hurts the community --- I think.
To sum up:
Is belittling language offensive? Independently, does belittling language hurt the community of SO (or any SE website, for that matter)? Finally, if the latter question is answered in the affirmative, is belittling language nonetheless not worthy of moderation? (And finally-finally, if the answer to that last question is "Yes," then why is it not worthy?)