Language does change, but there are cases when it gets confused. Your first statement is a very very hasty generalization, and I believe you will notice what I mean if you reread it. The common usage of "arrogant" is indeed what you have noted it to be, but that was not the way I used it in my argument, and neither it is the established meaning of the word in the academe.

Even if he is perceived as arrogant by others, that does not mean he is really arrogant. It is simply the case of mistaken expression. For example, if a girl is perceived as a whore by others because of her clothing or how she acts, that does not make her a whore, since the conditions of being a whore (as society understands it) may not be met. The whole argument was about whether Kei is actually arrogant or not, not if he is perceived to be arrogant. The standard for this, well, is the very definition I posted.

Like I said, even the word arrogant can mean different things to different people, and that is the main reason why me and animus don't seem to meet eye to eye. He is not necessarily wrong, if he is indeed basing his argument on the common usage of arrogant. But if we check the actual definition from reliable sources, then my argument would be correct. Since we probably did have a different understanding of the word, the conclusion is a moot point. I simply wanted to clarify this in my last post.