Are you a racist?

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Honestly, people claiming that everyone is racist is technically accurate to a degree, but by standard definitions is utterly wrong.

People make choices with whatever information they have, and most people do not have time to get chummy with someone from every race on a personal basis, so when we are in a situation where we are dealing with someone ANYONE, we will make our initial guesses as to their character based on other people with similar appearances. Why? BECAUSE THAT'S WHAT WE USE. Human's are something like 90% sight based for identification and analysis purposes. So yes, we will judge people based on their skin color and appearance.
Now what about the standard take on racism? well, when you're just meeting an individual for the first time, initial impression will of course be taken from what is known of the group they seem most similar to. If there is no personal experience with this group, they will use 2nd hand experience, either news, media, or from those you already know.

So yeah, technically everyone is racist, it's a survival mechanism, but hardly anybody anymore is actually "racist" in the classic sense of the term.