As long as this is andrew_'s personal experience, I don't see why I'd call him a racist regardless of the race he profiled the most. He even goes on to explain that there's a good reason for targeting white teenagers: they were the most likely to steal something, so they weren't targeted because they're white, they were targeted because they proved to be the highest risk.
Now if andrew_ had started generalizing, like you are doing, then I could see him getting called a racist and getting downvoted.
Now if andrew_ had started generalizing, like you are doing, then I could see him getting called a racist and getting downvoted.