Why is a healthy body not afraid of infection?

A friend contracted a intractable infectious skin disease. For the sake of children's health, many parents warned their children not to contact that friend again.

Except for a little boy, he still goes to school and plays with his sick partner as usual. Neighbors were surprised: because the little boy's parents are both doctors, he should have received more health education than others since he was a child. Doesn't he know why it is "dangerous" to do that?

A kind neighbor aunt reminded the little boy that the little boy looked at the aunt and replied, "Mom told me that a healthy body is not afraid of infection!" "

Sure enough, the little boy was not infected until his sick partner recovered.

A few years later, the little boy grew up to be a big boy, went to high school and was a good student with excellent academic performance. But the teacher found that he has a "shortcoming", that is, he loves to be with those "bad students" who are recognized by everyone. This is certainly not a good sign!

So the teacher kindly advised him to pay attention to his "good student" image. But boys have their own opinions: if I really become "bad", it can only prove that I am not a good student in essence. How can I blame others?

Life perception: If I am healthy, I am not afraid of being infected by others, because a healthy body is not afraid of infection; If I am excellent, I am not afraid of being taught badly, because excellent people will not learn badly.