User blog comment:Ash9876/Ashy's Reviews - Fairy Tail Chapter 470, Hybrid Theory/@comment-5914413-20160127142208/@comment-3030647-20160127233853

I think he was referring to mortals when he said Kings. If he was referring to Dragon Kings, then, well, you can see that no Dragon actually bows towards Igneel or anyone (i.e Atlas Flame, Grandeeney, etc)

But besides that, who knows. All I know is that Dragons really dislike anything being above them. Because, let's be real, what is?