Is it the fact that he dives or the fact that he dives in such an exaggerated manner that bothers us? Or is it simply that he dives and plays for club teams that we don't like?
After all, every footballer will dive (or exaggerate a reaction)in the right circumstances. Vieira, for instance, used to scream like he'd been shot whenever he wanted a free kick. Pires dived, Eduardo dived, Eboue dived to get us that free kick in the CL final - everyone dives.
The issue is not diving, the issue is refereeing. Players will do whatever is necessary (and - more importantly - whatever they are allowed to get away with) to win an advantage. Expecting them to do otherwise is naive and ridiculous. It is up to the officials to police it better - even through use of video replay if necessary. However, to vilify individual players for doing at a decisive moment what they all do as a matter of course is ludicrous.