This is my mother - in - law she is 72 and calls people my black friend or my spanish friend if there Anglo American she just says friend big red flag don't just listen to what they say listen to what the don't say but give away by other forms of language or in fur
Sadly, the reality is set in stone. Look at the person and if they are white-skinned, they MUST be racist. If they have colored skin, they couldn't possibly be racist. The only truth worthy of consideration is that EVERY person on this planet can trace their genetic inheritance back to black bushmen in Africa about two million years ago. So we are ALL brothers and sisters under the skin - your genes prove that!!!!
It can be detected just by their behavior around that specific race they don't like.
Although, be aware sometimes it may be a prejudice of another kind and they may not care what the color of the skin is. An example of that would be someone who really doesn't like vagrants or homeless people. I experienced this first hand once while getting a ride from a woman at church. We have the Rescue Mission next to the church and she was shocked and angry to see some of the homeless sitting on the church steps (I wasn't pleased at her reaction but didn't say anything since I was currently renting from her).
First you have to define what racism is. It's a relatively new word first used in the 30's. Originally, it was used to denote a sense of superiority over people of different or particular races. Today, it doesn't matter if a person feels superior or not. If you don't "like" people of a particular race or use a negative word about such people or apply a stereotype, people will refer to you as racist regardless if you feels that that person is inferior to you solely based on race. Because the word has been so used so liberally and varyingly, racism has become vague and less defined as time goes on. To answer your question, we need to know what you view as racism.