There is absolutely no way, if you watch that cartoon, that you would not think black people would be offended by it. Again, I don’t want to link to it, but it’s available to watch on the Internet if you’re curious. His claim of innocence was just a lie.
Edit: To whomever downvoted me- Scrub Me Mama With a Boogie Beat takes place in an all-black town called Lazytown where everyone is big-lipped, lazy and stupid but addicted to jazz. They also love eating watermelon. Do you really think Walter Lantz wasn’t a racist piece of shit?