Kristy, I am sorry you find the mispronunciation racist. I will agree it is exaggerated, but the whole movie is from a childs point of view at everything is exaggerated.
BUT, that does not mean it is not inaccurate that some people from different countries have a hard time with pronouncing words/sounds from other countries. My own relatives have a hard time with my name and in Denmark, I am more often called something more like Karl than Carol. (so much so they prefer to use a nickname) Likewise, they get a giggle out of my limited Danish skills.
I have lots of highly intelligent well paid tenants from all around Asia, and yes I answer to Cawol when they talk to me. Their children who learn English in school from start can say my name.
Just try and order a Jumbo Jack from Jack in the box around here, you get a yumbo yack instead.