The Vulcans in "Take Me Out to the Holosuite" were not racists. The Vulcan stated his physical superiority in a cold and logical manner, and what angered Sisko the most was the fact that he was right about it. The Vulcan was amused by Sisko's anger and competitiveness and studied him basically.
It's arrogance, but not racism. Racism is based on fear, insecurity and similar emotions. If you state "you are black and I am white", "you sit in a wheelchair and I can walk", "you are blind and I can see", "you are a woman and I am a man", "you weigh 300 pounds and I weigh 100 pounds", "you scored 10 points and I scored 100 points", you are stating facts and nothing else.