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"racial discrimination" shall mean any distinction, exclusion, restriction, or preference based on race, colour...or origin that has the purpose or effect of...impairing the recognition, enjoyment or exercise, on an equal footing, of human rights and fundamental freedoms...of public life.
If black history month is constitutional then why would white history month considered racist? White people have arguably done more for our country, wether they be French, German, British, etc. than black people have. For that matter why is there a distinction at all. It should just be HISTORY.
One definition of racism requires large powerful institutions that actively discriminate against a race. Whites largely control such institutions but blacks do not. Therefore, racism can only be white-on-minority.
There are races other than black and white.
Blacks control other institutions. Even if they're less powerful than white-dominated ones, this definition of racism can work against white in these institutions.
Ex: Rap Labels
The power of different institutions, as well as the controlling races, can be different depending on region and time.
Only in a few narrow and rare cases, such as rap labels. When it comes to education, housing, wealth and most other major areas, the disparity in power is so great as to make those few rare cases practically irrelevant.
The source you gave doesn’t say that racism require powerful institutions at all.
The first meaning have nothing to do with institutions, and the second meaning is just a extension of the first meaning to also apply it to institutions (and not only to individual).