I've flown a great deal/numerous airports. I've never experienced any negative behavior from a TSA employee. In fact, I've had fun with a great deal of them. I found, if I wear my "Bite Me" t-shirt, it's a hit every time!
There was an error on my part once. I forgot I had a bottle of water in my backpack and every bell and whistle in LAX went off! I was mortified, they were NOT amused. I tried to make the best of it, they were still NOT amused........
They (TSA employees) have a tough gig. Keeping us safe! While rude and arrogance is not acceptable, I prefer nothing to be overlooked when I'm up in the air! Pat me down, scan me, check my bags and do it again if need be!