Not certain about that.
I've read several biographies where he is described as a generally amiable person, albeit moody at times. Even when he was deaf, there are accounts of him as a pleasant old man who took his supper alone in modest taverns.
He had no patience for fools. When he was younger, he took great delight in destroying those who challenged his playing abilities, taking their themes, improvising on them and even playing them backward! After obliterating several pianists in this fashion, no one dared challenge him again, as he was the preeminent keyboardist of his era.
And of course, the nine symphonies, his piano concerti and numerous other works attest to his creativity and musical genius.
Beethoven was widely beloved throughout Europe, and all of Vienna turned out to pay respects at his funeral in 1827.