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Honestly, I don't notice people being that much nicer over the holidays. Part of it might be that you see people for the first time in a while, and act overly polite because of that. Some people just feel expected to be more charitable around the holidays, because that's become a social norm in America, and act accordingly. 
For a lot of people, it's also a reminder that they feel lonely most of the year, since so much media revolves around family and togetherness around Christmas. Maybe these "anti-social assholes" you speak of feel lonely around this time, and try to act nicer to compensate. Whatever the reason, I'd prefer people be nice 14 days out of the year than 0.
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