What was the underlying reason for John Ipe's disgust with the world?

John Ipe was disgusted with the world. He did not get his due. The moth, Pappachi discovered, was not named after him and it fuelled the fire that burnt within him, consuming him. He was ill humoured already, yet the fact that he was a retired government official without any fame, his wife who was seventeen years younger to him, still in her prime, was making good out of her pickle factory. This hurt Pappachi, it wounded his pride. He started beating Mammachi now regularly. Everything, from his never got fame to his wife's success wounded him badly and his frustration proliferated.