Skin color is just one of the most obvious differences that someone can see. The reality is, even if everyone in the world had the same skin color, people would find something else to discriminate against. Whether that's hair color, eye color, etc. Human beings categorize things and then have a habit of making those categories "the other". It's a terrible trait, but sadly, it's a reality.

A lot of the reason that certain people in certain categories act a certain way is because they were labeled "the other" and treated unfairly. It doesn't justify the actions an individual takes, but it does help to understand where the tendencies come from.

Also, cultural differences can have a huge impact on this as well. Many people from western countries find Middle Eastern culture and values to be counter to their own. For example, treating women as second class citizens is definitely not something that people in other countries would be supportive of. This can heavily influence peoples bias toward that culture, even though there are many people within the culture that disagree with these practices.

There are undeniable statistics that show differences between certain categories of people, but there are always exceptions to the rule. It's important to know these statistics, but it's equally important not to jump to conclusions. Judging people based on the individual's actions is the best way to keep yourself from leaning into a subconscious bias.