The image of the irascible Beethoven is almost a cliché, yet it is true that he responded with defiance and hostility to almost every impediment life presented. He fought with his friends and resented his teachers (especially Haydn). He loathed most of his aristocratic patrons, as well as the Viennese musical public. For Beethoven, then, universal brotherhood was always an elusive ideal, something to be realized in art if not in life.
Source: Washington Post.