My list would include:
1. Folks who let their kids indulge in unacceptable behavior -- a week ago, I watched a lady with two kids aged about 4 and 6, walk down an aisle at Wal-Mart, with her kids deliberately knocking things off shelves, they lady acted like she was oblivious to this and when I mentioned to her that someone might trip and fall on the dislodged merchandise, she gave me a look that would melt steel.
2. People who wear hats inside a movie theater (in particular cowboy hats) -- now I have nothing against hats and own a bunch of them, considering the sun in South Louisiana, but you don't need to be conversant with Emily Post to know it is impolite to wear a large hat indoors in the dark, at a movie theater -- I mean, there is no sunlight to protect against in a dark theater. However, there are those who think that their "persona" requires said hat indoors and that it is their privilege to do so -- recently, while taking my sons to a movie, this doofus did just that, sat in front of my youngest, who then could not see the screen. When I asked politely if he would remove his hat, I got a string of profanity (doofus was 18 -20 yrs old) -- I then stood up and told him that if he did not either remove his hat or go sit elsewhere, I would have theater management/law enforcement encourage his compliance, he got up and moved. But, it should have been just common courtesy to not wear the hat in a theater to begin with.
3. Folks who do not put their hand over their heart or remain silent during the playing of our national anthem -- I have no hesitancy to correct such rude behavior.
I am not a curmudgeon but I am disappointed at the lapse of civility in our society -- my parents raised my brother and sisters and I with a deep sense of respect for others and an appreciation of the value of good manners.