Let me make clear, I consider the two to be almost the same thing. Holy Communion in the hand has caused disrespect for same. Not in everyone, obviously...but it has really harmed people's understanding of Who we are receiving.
When the Pope distributes Holy Communion, note that the communicants are kneeling and receving on the tongue. This is no accident.
You both seems to miss the point here as well. The question of raising disrespect cannot be denied. However this is not a prime reason to ban Holy Communion on hand. This is anthropocentric perspective, exactly the problem of post Vatican II clergy. We should oppose such practice primary because parts of Eucharist wont be consumed and would stay on ones hand. We must treat real existence of Christ seriously to the end.