there is a fear in the jewish community that as like, your son gets older he might forget or drop the traditions in favor of the dominant culture. there is a joke too. "you don't need to worry about them forgetting they are jewish. if they ever forget, someone else will remind them" basically, even if you just wanted to be treated like everyone else, it won't be long until someone has to point out "jew! jeewww!!!! jjjjeeeewwwwwww!!!!!!" hence, the christmas thing.
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