Felling a bit puzzled and would like to know if I'm being unreasonable to feel like this.
Puzzled. Not upset. Not offended. Not embarrassed. Not humiliated.
I sent Christmas cards last week. Tonight my DS went out with his friends and asked me to pick him up and give his friend a lift home. The family of his friend was one of the recipients of the cards I sent. When I dropped her off, the dad opened the door and thanked me for the lift and then said "Do you mind not sending us a Christmas card next year please? Just because it's embarrassing. We don't celebrate Christmas".
Polite conversation: thanks for the lift.
Polite request: do you mind not...
Reason given: We don't celebrate Christmas
I'm a bit hmm. I'm not religious and neither is this family but in our family we still celebrate and give each other gifts.
That's fine for you to celebrate it despite not being religious. It's also fine for them not to celebrate it. It's their choice and the polite thing to do is respect other people's choices.
I know this family quite well, we've been on holiday together and sometimes hang out at the weekend...
Great. So you know that they are nice, reasonable, polite people, presumably?
I was aware that they don't celebrate Christmas but thought a card would be gladly received as it's also wishing them well for the new year.
And now you know they would prefer not to get one, so you can respect that preference next year.
AIBU to feel it's a bit of an odd thing to say?
YABU to feel this, yes. Unusual, I suppose, since not many people feel this way about Christmas cards, but since he does, and since you are friends, why wouldn't you want to know that he prefers not to receive them?