On Sunday at San Siro, Inter captain Mauro Icardi stepped up to take a penalty in his side's Serie A clash with Cagliari. The skipper's spot kick went wide. Cagliari's supporters celebrated wildly but so too did the Inter ultras standing on the Curva Nord. It was a strange sight but wholly unsurprising. Those same supporters had unfurled a banner shortly before kickoff which savagely expressed their disdain for their team's leader. "You use a child to justify yourself and throw mud in our faces. You're not a man. You're not a captain. You're just a vile piece of sh*t.