In the middle of Memorial Day, my wife and I punished my two oldest children. We love them more than life itself and have the highest hopes for them, but of course that doesn't eliminate the paths to frustration with them.In particular, they have developed some sort of simultaneous mental block to saying hello to people they know. They resist a friendly greeting like some sort of evil bacteria. I understand shyness - I was the shyest one in my family as a kid and it still crops up from time to time today. But these kids got to the point Monday where their grandparents, who have been very good to them, said hello and the kids didn't so much as look up. It wasn't shy - it was dismissive.That ain't right. It's damn vexing, and it only seems to be getting worse. To be sure,