Oy, fun reading!!! Let me add a few, and I am guilty on some of these:
If you see a discarded Sabiki cardboard and think "hmmm, I can use that to wrap my own sabiki," you are a pier rat.
If you use a piece of cut up Mackerel or Squid left behind by someone else on the pier cutting board then you are a pier rat.
If you proceed to smack a live Mackerel on the floor to kill him in front of a bunch of horrified tourist then you are a pier rat.
If you proceed to dispatch a shark or sting ray spewing blood everywhere in front of a bunch of horrified tourist then you are definitely a pier rat.
If you come to the pier at 5am, fished for a few hours and took a nap laying on the floor somewhere on the pier just so you can have energy for the fishing in the afternoon then you are a pier rat.
There is No Overhead Casting sign, you look left and right and behind to see that no one is coming and proceed to do an overhead cast then you are a pier rat.
When your phone's picture library is filled with more pictures of fish than your wife or girlfriend then you are definitely a pier rat.