The OK sign is only racist if it's being used by racists to signal to other racists that they are racist. This remains true if you replace "The OK sign" with an

The OK sign is only racist if it's being used by racists to signal to other racists that they are racist. This remains true if you replace "The OK sign" with any other innocuous act or item. These kinds of statements are the result of a wretched game of Telephone. "White supremacists are using the OK sign as an identifying signal" became "Crazy leftists say the OK sign is racist". It's an effective recruiting tool on the uninformed.