Thirded.
Sorry, I haven't yet met a polite TSA agent - I was once flying through Miami International and the guard (a guy) asks me to dump the contents of my purse into one of those plastic bins after it went through the X-Ray. I do so, and he picks up a zippered pouch that I kept pantyliners in, opens it and proceeds to thumb through them (no gloves). He fans them out like a deck of cards, and asks me, "what are these?" I was so pissed off I told him they were a food processor, at which point a female agent finally came over and asked him why he was pawing through my pantyliners.
Last year I was going through Chicago and the TSA agents had an old lady, I mean seriously old, who needed a walker to stand up isolated next to the security checkpoint. She was crying because she needed her walker to stand, but they wouldn't let her have it because they were wanding her. Two other guards had to come over and hold her up by her arms while they wanded her.
This past March I was going through JFK International in NYC and having injured my ankle in the City I was walking with a metal cane. I put the cane down on the X-Ray machine, and the TSA agent told me that because I didn't tell them I had a cane (which I thought was pretty apparent), that after it went through the X-Ray I'd have to be wanded and it would need to be wiped for bomb materials. He also gave me a stern lecture about how I could have shut down the checkpoint for failing to alert the guards to my cane.
Oh, but I feel safer. I really do.