We also have to remember that we tend to look at history with current eyes, and history always looks bad unless one remembers that times were different then, people were different then and the reason why we have made progress in areas such as ethnic or race relations is based on the fact that times were different then and people wanted that to change...so we progress to what we have now.
I always think that 50 or 75 years from now, someone is going to be looking at something we do now that we consider acceptable and say "I can't believe they thought that was OK".
I am quite sure Walt Disney was human. I am quite sure he had the same faults and foibles as the rest of us. From what has been posted, it sounds like he was not any more or less anti-Semitic than anyone else of his era was.