Christians should celebrate Christmas exactly as they prefer.
It is a day associated with the assumed birthdate of the founder of their belief system. However, it is also a cultural experience as well. With many varied cultural nuances that are also beautiful and fulfilling.
Expressing the spiritual foundations established by Jesus of Nazareth should be the primary aspects of this special day. However, there is no harm in enjoying the cultural aspects of this holiday as well.
As Jesus said: “Render unto God that which is God’s and unto Caesar that which is Caesar’s.”
Be aware that Dec 25 is not actually the real date on which Jesus of Nazareth was born. This date evolved out of a Roman celebration of the birth of numerous gods on Dec 25.