I suspect if there is large scale residual use of deregatory terms, its by folks who made the initial 2003 (maybe 2004) deployments, but none since or the train up that accompanies them. Our soldiers are becoming culturally saavy, and astute. The only other people I've heard use deragatory terms were some of the people who never left the FOB or interacted with Iraqis (Arab, Kurdish, Turkoman, or other) as people.
I'll note that this may be the case for some, but many Marine veterans I know who have just returned from a third deployment had some rather, shall we say, insensitive things to say about Iraqis. To be clear, these are guys who have lost friends over there.

This is, of course, not everyone.