No one aknowledging last day at work after 15 years?

[Babyroobs]

Yesterday was my last shift at work after 15 years of being there. No -one seemed to know it was my last day ( although bosses obviously knew as I handed my notice in 4 weeks ago. ).
AIBU to be upset that no-one had even bothered to get a card/ bunch of flowers / cake ? Half way through the day, the person in charge said I should come back in a couple of weeks for a send off/ tea. AIBU to think they should of got organised for the day I left ? I'm unlikely to go back , I have a new job and a busy life.

Nobody gave a shit when I left my last job after 5 years, it was a bit weird as I had quite a few friends there and was generally the person people went to for advice or problem solving or IT issues etc.
There were obviously favourites in that office though, some people got huge amounts of gifts, special lunches, books full of photos and quotes or memories of their time there...I felt really low and unappreciated when I went.