YABU. I can see your point, and fair enough if you don't want to send cards, but it seems a bit mean spirited to 'hate' them. They are a gesture from people who care about you to show they care.
I love getting cards. I send about 50 birthday cards a year and about 70 Christmas cards. Plus wedding/engagement/bereavement/new baby/new home/new job/big anniversary etc as appropriate. And as a family we get pretty much the same in return. I'm only 30, so hardly ancient, and all bar one of my friends send cards (and not just to me!)
I cannot ever imagine my friends writing a letter! And I hate getting loads phone calls on my birthday - I'm usually busy celebrating and I end up having to make endless small talk with everyone.
Cards show way more thought than a text or call. They require someone to have remembered, bought the card, written and posted it in advance. Rather than seeing some posts on Facebook and thinking 'shit its Agent's birthday' better drop her a
quick text. Plus cards make the place look festive.
If someone didn't want to send me a card, I wouldn't be upset or anything - it's a nice bonus. And any thought, be it text/call/letter is very kind but I think it's a bit mean-spirited to hate people thinking of you and sending you a kind gesture.