It was more than just criticism, it was mockery (which was sometimes funny, sometimes not). And it wasn't really a big deal, at least to me it wasn't. But I don't see why people would be more upset over the exaggerated praise and gloating than the insults Marchisio was getting.
The pointless trolling I saw was far more present in Vidal's thread, the mockery (comparing him to Amauri ffs) in Krasic's.
