Doubt it all you wish. I didn't say Reagan made some pronouncement to that effect personally (though he probably did at some point) but it's unarguable that his Justice Department assisted the pro-Bob Jones side in that case.
This was considered a little daring nineteen years ago, but it hadn't yet become the capital offense it is today.
I again return to my question: How pure on this subject would you like to be? Apply modern racial hysteria retroactively and American history will have one long rogue's gallery and no heroes.