During a match, I can understand and accept some harsh comments. It's obvious that the guy is giving his all, never gives up, but he's simply not good enough anymore and that makes the fans frustrated.
But the pre-match and post-match harsh comments, even insults, are unacceptable. It's surely not his fault that all his coaches see some things that he offers and play him. They all respect hard working players with never say die attitude. Brazzo is paying them back with occasional goals and assists (in Juve he has a pretty solid record of goals+assists per minutes played).
It's another thing to criticize a player that you know is able to do much better and to try much harder, but doesn't (like Tiago), but the same shouldn't be done for guys like Salihamidzic.