He might not be a bad guy, but Shin needs to give him a good beating to show him how big the world is.
It's psychologically interesting how Shin is acting so humbly and pretending to be just another adventurer, well beneath the nobles, even if a little bit strong one. He can do it without any negative feelings because he naturally knows he's, in fact, a legendary high human in that word and undoubtedly one of the strongest individuals alive. He's also wealthier than probably any noble family, unless there's one with another high level player present. In fact he likely has enough wealth to buy a kingdom. All those narrow-minded locals have no idea and look down on him, which he probably finds funny. Since his basic personality is mellow and not arrogant, he must find the situation all amusing, not offending.