Are Idaho Travelers Just More Polite Than Other Places?

This is the scene from my flight yesterday.  I was headed back to the Treasure Valley from Texas through San Francisco, and my seatmate decided to get a little more comfortable. 

She decided to take off her coat.  No worries.  Shortly thereafter, took off her sweater.  Fine.  Then took her hair out of her ponytail (and shook it around and complained about how greasy it was).  Hmm.  We're reaching a dangerous place here.  Finally, in order to achieve true comfort, she shed her shoes and socks, and decided it was time to be release her feet from their socially acceptable bondage.

I don't know why, but being barefoot on a plane strikes me as a bit strange.

I know this is not one of our world's biggest problems by any means, and full disclosure, I will wear flip flops when traveling in warmer weather, but I'm surprised when people choose to take it further.

For example, she got up to use the restroom and did that barefoot.  As a germaphobe, I can't even understand how you could tolerate walking into the bathroom on an airplane without a hazmat suit, let alone your bare feet.  She also (as pictured) had her feet all over the back of the seat in front of her, sitting on the seat, and even on the back of the armrest of the person in front of her.

I was trying to decide if it bothers me because of my germaphobia issues or if it was something else.  In the end, I think to me it's just rude.  Feet are one of those things that people have very different feelings about.  To some, they're just the things that get us from here to there, but for others it's a little more intimate.  They are turned off by seeing others' feet.  Then you get into the hygiene conversation...that's a whole new can of worms.  It just seems like if you're wearing sandals or want to go barefoot, maybe you should keep that to under the seat and near your shoes?  Is that a win?

For what it's worth, this isn't the first time I have experienced this.  This moment happened a few months back:

I also realized, this has NEVER happened when I was flying to or from Boise.  It was always the connecting flights.  Maybe we're a more polite or more concerned society here in the Treasure Valley?  Whatever the reason, I appreciate that we're less free with our feet on the flights.