The problem is how you define acting shady. If you're definition is people of one demographic generally dress this way therefore I think it's suspect you have an issue. If you're definition is someone who doesn't dress or act the way you, or the people around you do, again you have a problem.

Also let's keep in mind that this is the safest the world has ever been especially in America meaning statistically if you're assuming someone is up to no good based on their appearance or dress you are almost guaranteed to be wrong.