"African American" is an identifier for people with African ancestry.  It's use to describe oneself is a personal choice, just as is your self-description as "White", European", or "Caucasian" (which is a complete crock of old cheese). Hindus don't call themselves "African-American", yet have skin comparably as dark as African-Americans.  Same with Native Americans, including Mexicans.

This in no way "kills" Al Sharpton, Jesse Jackson, or the Black Lives Matter movement.  That notion has no rational justification, just as saying White' identity "kills" the White Nationalist movement or the White supremacy movement of the  KKK.

But I agree with you - "It's way past time to start being a part of humanity and forget about using those childish crayons."  Please lead the way.

Black lives matter because African-Americans are discriminated against every day, in every way.  You can't make that problem go away by pretending it doesn't exist.