Okay so I WORK at an airport, so I encounter the people he named and THEN SOME. I could go on all day about the people I encounter, but I'll just name a few.
The oblivious parent(s): these are the parents traveling with a small child or two (or, God forbid, more!!) and their child is SCREAMING and they don't seem to hear them. They just go on about their business of putting their shoes back on at the checkpoint or buying their venti-triple-shot-skinny-extra syrup-mocha frappucino-with no whip cream while their child vocally assaults everyone's ears. OR the child(ren) is running around, climbing on things and touching stuff while everyone looks on like "I swear to God my child would NEVER act like that. Why don't they seem to see/hear their child??"
The last minute passenger: these are the people that get to the airport 20 minutes before departure time, join any line at the airport (whether it be at the ticket counter, the checkpoint, or any of the vendors on the concourse) and they ask of they can jump ahead of you because their flight is about to board/leave. Um...no!! I got here plenty early so I could make my flight and you should have too. Poor planning on your part does NOT constitute an emergency on mine. (These are also the people who get REALLY pissed off if you tell them that.)
The laundry hamper: these are people who look like they're wearing clothes that haven't been washed in weeks (and sometimes smell like it too). They're wearing socks with sandals and the socks look like they were probably worn as shoes because they're so filthy. Shirts are usually oversized and wrinkled and have holes in them. Pants are usually dingy, faded pajama bottoms. The person looks borderline homeless. And you look at them and you think 2 things: 1. How did they afford a plane ticket when they can't seem to afford SOAP?! 2. PLEASE don't let them be on my flight or sit next to me.
Like I said, I could go on forever cuz there are tons more, but those are just a few I see on nearly a daily basis.