1) No, about 90% don't care what you think and are rightfully making fun of you for it. You don't get to determine how others enjoy their Kinnick experience. They have every right to show up late, leave early, or play on their phone if they so choose. They (for whatever reason) payed for the right to do so. I personally get there on time,leave after the game, and outside of taking a picture or checking a score, don't have my phone out. But that's what I decided. If you don't like what others do there that has no effect on you, don't go. Or get club seats where you're not "inconvenienced" by others.
2) Doubtful.
I was sitting in club seats ... and yes people who walk in front of me as I am trying to see the game because they are either late or just don't care does "affect" my enjoyment of the game .
Therefore show up on time or don't expect me to let you walk though unless it's a timeout or stoppage of play. If you must go to the restroom or grab a snack at least do it when the game isn't in progress, otherwise I will rightfully let you know that you are being a discourteous asswipe.