Lots of Variability in Airports
I think Bart must be training the folks in San Antonio. I have actually observed TSA agents following Bart's training example. On the other hand, Bart needs to get cracking. Other airports do need training. I can't think of any off the top of my head that stand out. I'm sure others can.
In my experience, the higher the cost of living in an area, the worse the airport security experience.
In San Antonio and other cities in Texas, TSA provides a living wage and is rewarded with better than average workers.