Err, I think it has been established that Kei is arrogant to Hikari, but that is simply for teasing.

The line you just quoted illustrates my point perfectly. Do you honestly think that they don't deserve such a comment? That's not arrogant. He was just telling the truth.

I think you are simply stretching the definition a bit. If you read the dictionary (like you should) from different sources, and try to understand the implication of the definition, then it is clear there is a negative meaning to it, in the sense that the belief in oneself or self confidence is in excess. That is in every definition you can find, or at the very least almost all of them. If you can find a definition that says arrogance is justified and is not an excess of pride or confidence, please post it.

Still, I am simply being sensitive to the intricacies of language. Meanings of words tend to become confused in time. I do understand what you are trying to say, its just that the word for it is not arrogant.