Christmas is meant to be a joyous occasion, one that everyone should experience. It is not a joy tied to presents or even time spent with family members, but a joy firmly rooted in the coming of our savior on Christmas Day.
This means that no one is excluded from true Christmas joy. Whether you are rich or poor, with family or alone, everyone can rejoice on Christmas.
Here is how Pope St. Leo the Great put it in one of his Christmas sermons from the 5th century.
Our Saviour, dearly-beloved, was born today: let us be glad. For there is no proper place for sadness, when we keep the birthday of the Life, which destroys the fear of mortality and brings to us the joy of promised eternity. No one is kept from sharing in this happiness. There is for all one common measure of joy, because as our Lord the destroyer of sin and death finds none free from charge, so is He come to free us all.