I agree, and have explained this to my boys. I won't go into details, but I have experienced prejudice because of my speech and it is disheartening. To be judged because you are raised in a different part of the country or world is simply wrong, as is all prejudice. That said, at some point I realized that the world is a hard place and that the bias wasn't going to just go away because it was unfair, so I began working on my speech and turned around those perceptions. But I alienated a few folks from my home because they felt that I was ashamed of my past. Nothing could be further from the truth, but how do you prove that? I had to choose between some friends and a successful future in the business world.
Right or wrong, these kids are going to be judged based on many things that have nothing to do with their abilities. We can try to avoid this kind of prejudicial behavior as individuals, but most don't even make the effort.