It's wrong judge someone based on a stereotype.
Roger is a store manager, and a black person walks up to him holding a wallet he found on the floor.
Roger wants to get the wallet to the rightful owner.
Roger thanks the person for bringing the wallet and saves it for when the rightful owner returns.
Roger accuses the black person of stealing the wallet and calls the police.
The rightful owner gets their wallet back and is grateful to Roger.
Roger's business suffers because he is assumed to be racist.