Now, you may not have heard of heightism before, but it's like other 'isms'-like racism, sexism, ageism and other 'isms' that highlight a particular kind of discrimination or unequal treatment that people experience.
What we have is data on the world as it is and we have serious problems with racism, sexism, classism, ageism, in the world right now so there is no such thing as perfect data.