That picture is probably the only thing out there that shows he has won one of these things before. From that, you can probably get a better understanding for why he might be angry about losing this time around. Obviously that doesn't justify anything he did, but it does help to provide some important details on his background. If people truly want to understand why things like this happened, that picture helps.
I haven't gone too in depth on the coverage of this thing, but nothing I've seen/heard is focusing even for a second on what logo he was wearing in a picture from last year.