I always hear people calling him a racist and a bigot but I have never seen any evidence for this apart form the odd inappropriate characters in some of his movies but these characters are only considered offensive by todays terms and were pretty accepted back then.

When reading his quotes I always thought he seems like a great down to earth guy with pretty decent morals here are a few of his best in my opinion.

"A man should never neglect his family for business. "

"I have no use for people who throw their weight around as celebrities, or for those who fawn over you just because you are famous."

"Tomorrow will be better for as long as America keeps alive the ideals of freedom and a better life"

"My business is making people, especially children, happy."

"I have watched constantly that in our work the highest moral and spiritual standards are upheld, whether my productions deal with fable or with stories of living action."

Edit - Did a bit more research on the subject and it seems incredibly unlikely he was a racist at all. If you are really interested take a look at this article

Here is a paragraphs that stuck out to me.

"Walt was sensitive to people's feelings," composer Robert Sherman told me. "He hated to see people mistreated or discriminated against. One time, Richard and I overheard a discussion between Walt and one of his lawyers. This attorney was a real bad guy, didn't like minorities. He said something about Richard and me, and he called us 'these Jew boys writing these songs.' Well, Walt defended us, and he fired the lawyer. Walt was unbelievably great to us."