Why does every story with a king mc pretend like people shouldn't bow to them? Hell, many even go so far as to request to be called older brother or young master or some sht. You're a lord, people bow. It's like telling a modern person not to grab their phone and take a picture when they see a super celebrity out and about.
He's obviously not used to that kind of thing, it's like living as a normal person doing everything by yourself and then people come to you telling you you're the heir to a billion dollar empire, would the change be automatic? No, there'll be an adjustment period.