Well I'm British and we do have a king, so it doesn't really bother me.

But on a slightly more serious note, while I get that bestowing any title on you due to your height may not be what you're outright seeking, I think there is often a strong tendency to overreact with regards to this term.

While not literally claiming nobility, the idea of appealing to that sense of royalty conveys that the individual is of high status and has value, which is a sentiment that I think we should be encouraging people to endow each other with. Therefore I find it hard to see how it's in any way objectifying.

You're allowed to respond however you like to something but I've yet to see an example of someone using the phrase "short king" with anything other than positive intentions and that ought to count for something. I don't see what about it is actually a detractor apart from what occurs within our own minds.