Booing is no fun. Acknowledging that a player once played for the Kings, and then immediately forgetting all about it, and moving on in process, seems to be much more enjoyable.
Unless you're talking about Olden Polynice. I remember booing that guy his first game back in Sacramento (when he was on the Sonics, I believe). Actually, I also remember the entire arena heckling him so much during a trip to the free throw line, he actually threw up a couple of airballs...