Hard for us to say much considering the Temptation 'You suck!' chant, but this is far worse.
The whole cheering for injuries has no place in sport anywhere. I don't give a damn about your affiliations, fantasy football leagues, wagers, etc., it's bullshit and a display of utter classlessness.
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"I don't get sick. I don't observe major holidays. I'm a jackhammer." - Jim Harbaugh & Dwight Schrute