A few weeks ago, I saw a young boy riding his bike in the street at a busy intersection. When he rode slowly by, I said, 'Excuse me, young man -- be careful, this is a busy intersection; maybe you should ride on the sidewalk.' He was no bigger than a third grader -- how he responded was quite disturbing to say the least.
What does it mean to treat other persons as ends-in-themselves and never merely as means? Well, the central idea is that every human being deserves to be treated with dignity and respect, that in all of our interactions, even with those with whom we disagree, or whom we don't like, or who may even disgust us in some way, we must engage them in ways that recognize their humanity.