http://fivethirtyeight.com/features/no-city-needs-a-championship-as-badly-as-philadelphia/
true, although perpetuates the stereotype of Philly fans behaving badly. Yes, there are some fans that behave badly and in an unacceptable way. But there are bad fans in every city. The idea that Philly fans are particularly bad is overblown.
As for throwing snowballs at Santa:
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it was in 1968, 50 years ago
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the Eagles were having a bad season
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just when it looked like the Eagles would get a high draft pick and maybe improve, they started winning and and their draft prospects dropped. So they have a bad team and no high draft pick. A frustrating situation.
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The guy that was supposed to play Santa that day was a no-show. They pulled some guy out of the stands that was dressed as Santa. Only his costume was terrible.
put a lousy season without good draft prospects together with a lousy looking Santa and a lot of angry fans and you get people throwing snowballs at Santa.