Is this wrong for a school to do in phys. ed?

Hi i am a freshman in high school and we have a fitness program for physical education. the first thing they do is take your bmi then according to that they give you a program you have to follow in the weight room. i got a bmi of 22.3 and they gave me one for healthy/over weight. the other categories are under weight, underweight/ healthy, healthy, overweight, obese. first of all im pretty sure bmi calculators are unaccurate but is it right to single out certain students for their bmi? only one kid in my class has obese and i think its very degrading hes the only one on that program. is it wrong for the school to have a program like this? thanks for reading/answering.