Maybe we can use context or something to figure out if they're being racist?
Like, for instance, if they're at a rally and the person next to them is chanting "White Power" and they flash the "OK" symbol, maybe they're being racist? And maybe, if they put the OK symbol below their waist and try to make you look at it as a joke, they're not racist? And, like, if you ask a Klansmen how he's feeling, and he gives you the OK sign, maybe he's not being racist with the gesture but is still racist beyond the meaning of the gesture?
that's what they're counting for, so they can thrive with dog whistles like this one: