You got what you wanted in the end hahaha, but your mom had a great excuse not to let you, that you have food at home too. ๐ I am sure she understood your wish, despite the tradition that Christmas should be celebrated in the family. Memories... how nice, right?
Probably it was not popular at your place or in your family, it depends on the habits of a certain place. In my country it was also popular to send cards for Easter, but in Spain not really.