Don’t forget to forbid the wearing of high school letter jackets, along with the various pins indicating achievement in sports, etc.
Yes, letter jackets would certainly be one of the most blatant examples of how most students are excluded and made to feel left out. And the larger the student body, the more students who are made to feel left out.
Elimination of all sports, clubs and other extra-curricular activities is the only solution. Except, of course, all those ethnic and group identify type clubs would still be encouraged, as long as they were politically correct.