I think it's the way he went down that exacerbated the situation.
Not sure that there is overall condemnation of flair and fancy in football. Ronaldinho is the most recent purely skilled player to grace european football and there was never any negativity surrounding what he could do. But Ronaldinho was a good sportsman and had mutual respect with his opponents. He always played with a smile on his face. Neymar is an arrogant, dirty little bastard. So when he tries to pull a shifty like that, fails and then dives as he did you would want to wring his neck too. If you're going to be arrogant, you have to back it up otherwise you're fair game. Don't fluff the an unrealistic piece of skill and then fall over.