The term "certain demographics groups" is code for "people who are unfamiliar to me." Then, you do the math. For example, if you have no white friends, then most of the rioters tend to be white in your view of the world. If you have no black friends, then most the rioters tend to be black in your view of the world. If you have zero friends on the other side of town, then most the rioters tend to be on the other side of town... and so on.

Before a moderator comes in and starts barking about how this is off topic, I'll say it's definitely not. In a survival situation, it's important to have an honest view of yourself so that you can better distinguish truth from misconceptions. When you're out there stranded, you may have to depend on people who are unfamiliar to you. If you come into a situation with misconceptions, you may act in a way that's detrimental to your own survival.