It is important to realize that they did not reject Jesus because of who Jesus was. After all, they had seen him turn water into wine, walk on water, and feed 5000 people with five loaves of bread and two fish. They had seen him heal people, and restore them to their lives within the community. They had watched him make the claim that he was the Messiah. And then, they tried to force him to become their king. They obviously were pretty excited about Jesus. 

So what gives?