It is not discrimination, but your outcome will end up skewed. Just look at affirmative action and racial structure of US universities. As it stands a quarter of students at high end universities are Asian, yet Asians make up only ~6% of US population, and this is with affirmative action hampering their enrollment and making it harder for them to enter universities. I personally think that it is bullshit what is being done to Asians in America, but it is done because people at large have complained about the racial inequalities in education.

A lot of the differences between groups are cultural btw, not genetic.

IQ is genetic, this has been shown time and time again, and in almost all of the modern day jobs IQ is the primary determining factor of success. It has been shown that high IQ correlates with high success in life. There are other forms intelligence, which are also genetic, but those are largely unimportant in a modern industrial and information based society.