Imbue,
I don't have to read the link to get the idea. I agree with the quote you provided. It happens all the time.
Let me tell you a story that happened about 30 years ago. My wife and I and our three young children went out for a country ride. During our travels, we noticed a college baseball game in progress, and decided to drop in. It turned out to be our local community college playing against a similiar team. Now, in the stands, there was no one except my wife, myself, my three young children, and a young college couple. Since the seats were empty, we let our kids run and play. The young woman, an education major, told her boyfriend that my children were hyperactive, which is called ADD today. They were not. They were healthy, energetic kids who were out having a good time. They never had problems in school of a disiplinary nature, and this young chick was there diagnosing my children. Now, I remember that inappropriate behaviour on her part to this day. That is the kind of crap that sticks in my craw.