@Joseph
Why do you write words that were NEVER posted?
Neither the OP or myself said the card came from a ‘Friend.’
Some businesses, professionals, neighbors and politicians send greeting cards this time of the secular year.
Those who do not live their entire life in a self imposed ghetto are likely to have some interaction with non-Jews in America and other places.
I don’t have a Jewish cleaning lady, I highly doubt one exists within 50 land miles of my home. Should I not open a card that comes from my cleaning person with her heartfelt wishes? No, I have good breeding, will open it, read it and when I see her I shall thank her for remembering me/us.
Not every business I can use for my personal and professional needs is or can be owned by a Jew. If my banker sends the CTL firm a holiday card wishing us a prosperous New Year and appreciating our business, should it just be tossed in the trash? NO
I know you work among Non-Jews as you have posted you teach in the NYC Public Schools, so you venture beyond the ghetto walls, learn to behave like a mentsch, you represent frum yidden to those who have little other interaction with us.