If we stereotype people, it will be hard to approach to people who we first met = met for the first time. We shouldn't judge the book by it's cover. Also, people should not judge others by looking at their appearances. When it was the first year of my middle school, nobody really talked to me because I looked really scary. But I can be really nice to my friends but they just thought that I looked like a gangster. So people should not stereotype other people to not hurt others. (Or you can use this: "because they may end up hurting other people)

I'm really sorry about what happened. And yes, stereotyping is not good. Great job Peter! ^-^