I always wondered if my poking at the screen was bothering anyone..
That said, it's funny to note that many of the airport complaints aren't problems at my home airport. It even has water fountains and observation decks outside the secure area. Go Tampa!
My pet peeves:
That strange amoeba-like pattern that ends up beings on nearly everything that will get heavy use. From carpet to cushions to wallpaper. Barely visible little blob patterns in a blue on a grey - you know you've seen it. It's meant to hide stains and such not being a flat color but really is just ugly.
"Floating" door stops that are meant to keep the door from hitting the wall. More often then not i step on it or stub my toe.
Mirrors on closet doors that the room door opens toward (hence the door stop). Whose bright idea was that?
Tiny trashcans. Not just small, but weird shapes too. We all only throw away 8.5x11 paper in our hotel room right?
Bad paintings of children - creepy. Bad paintings of seascapes and boats - just ugly.
At the airport - individual seats with no armrest-less seats. Those airports are wonderful (sarcasm) if you are stranded.