Ever since the racist southern democrats fled the party to take control of the Republican party in response to Civil Rights, and trapping the GOP into a platform of race-based disenfranchisement in public law and policy, throughout the country, for a generation up until current times, there really is no argument to be made that a GOP supporter isn't racist.
It's the central pillar of their platform. They use different terms now, they would call them "PC," but it is a platform or racism. Every single one of them hated Obama, not because of policy, because they don't have a single fucking argument couched in any kind of actual human reality about actual policy that they disagree with. It is all invented horseshit to cover the fact that they dislike his blackness. It was fucking instant the day he took office. The Teabaggers, these insurrectionists that came out of the woodworks to attack the idea that African Americans can gain a single foothold in this country.
It has never stopped, and until everyone recognizes this plain fucking truth, it will continue. If you support a single GOP policy, at any point, you are a fucking racist. It isn't any other way.