It's wrong to have a
general mistrust of an entire group of people based on physical appearance. There are certain situations where it might be warranted, but to just have a
general mistrust of a group is prejudice. Even if the statistics back up your opinion, it is still wrong to generalize. For example, Asians are commonly stereotyped as being better at math.
This source says that Asian American SAT scores in math average almost 60 points higher than any other group. Statistically, Asian Americans are better at math than other American races, does this make it not racist to generalize Asians in math? No, it is still racist, even if they are better.
No matter how you look at it, generalizing is wrong.