Even though the term is normal, its roots go back to a racial interpretation. 

The word “itis” is originated from the word “ni**eritis”. 

Before, the term was used as a stereotype to describe black Americans. It described them as lazy people who took heavy meals and didn’t have anything to do. 

So yes, the term is racist. We probably use the word here and there in our daily life. But if you look at its origin, and how it was used in the past, then it is a racist word.