Am I just old fashioned?

When I was growing up it was customary and good manners to thank people for presents.  This was usually done in the form of a letter even if the present had been given face to face.  The same went for meals at somebody's house, it was also customary to write a thank you note.

It all seems to have gone by the board, we're all so obsessed with ourselves that we don't think of others anymore.  I'm tired of giving presents to people that don't even acknowledge that they've received them.  I don't expect recipients to like everything I give them but I try so hard to get the right thing that the least they could do would be to acknowledge receipt thereof.

Recently an elderly acquaintance was kind enough to give me some highly perfumed ginger plants and cut flowers, the flowers are bright yellow and absolutely enormous.  I love ginger plants of all sorts so I wrote her a thank you card and posted it.  Choosing to post it was also a deliberate act, to show that I appreciated her kindness enough to buy a stamp.  I could easily have just put it in her mailbox as it was as close as the post office anyway.  I'm not saying any of this to big note myself, just to point out that common courtesy is thinking of how others will react.

A few weeks later she left some different gingers on my doorstep when we were out and left a note thanking me for the card and said old fashioned and how lovely it was to have done that.  I really appreciated knowing that I had pleased her in return for the pleasure the ginger plants and flowers had given me.

If anyone can tell me what I am doing wrong in giving presents and expecting acknowledgement, please do so.