The difference between prejudice and racism.
Both are blights on our souls, and both must constantly be fought. Prejudice is like contaminated ground water that seeps into our wells, whether we want it in us or not. We must be vigilant against it, and active measures are continually needed, on both a personal and societal level, to filter it out before it seriously poisons us. Racism is like cheap rot gut liquor that some people willfully purchase and then gladly revel in, poisoning themselves while trashing the world around them.
We can both be prejudiced and opposed to prejudice at the same time. We can fight to rid ourselves of our own prejudices. We can expose ourselves to diversity, we can open our hearts to cultural differences. We can listen, we can learn. But racists wear their affliction with pride. I have some empathy for those with untreated prejudices. Some can be worked with, some can be reached. Racists however are my enemy, and our President is one of them.