Racism in a regular character: depressing. Racism in a grandma: hilarious.
This is a situation where the old woman who you expect to be a cookie-making nice old lady starts unexpectedly spouting obscenely offensive comments (though as the page image shows, they can do both). This is usually Played for Laughs. This can apply to any elderly character and any kind of political incorrectness, [...] [tvtropes.org]