Why does Herman E. Calloway not like Bud?

In the novel Bud, Not Buddy, Herman E. Calloway is an old, cantankerous individual who is hard to get along with. He is a famous musician who has lost the love of his life, his daughter. Herman's typically irritable disposition is magnified when Bud Caldwell walks into the Log Cabin and claims that he is his father. Herman, who is way too old to be Bud's father, is not amused. It is likely that this is not the first time that someone has claimed to be Herman's child, being that he is a famous entertainer and women looking for financial stability often make that claim. Herman E. Calloway views Bud with contempt because he knows that he is not Bud's father, and thinks someone may be trying to swindle money from him. Regardless of his suspicions about Bud, Bud gains favor in the eyes of Miss Thomas and the band. Herman may feel jealous that Bud is getting positive attention. Also, having an unfamiliar child in his house upsets Herman because it is one more person to care for and look after. The last thing Herman wants is the responsibility of supervising and supporting Bud.