A hardcore Baptist kid wouldn't need to see what the gay kids were up to, and the gay dudes wouldn't need to see the Baptist kid throw up disapprovingly every time he saw the all-nude Oscar party going on in the showers. That, my friends, is federalism. Of course, it doesn't solve everybody's problems. Despite what identity-politics demagogues might tell you, not everybody fits into each category neatly. Gay kids can be jocks and study geeks.
Exchange students can be huge stoners.
And sci-fi geeks can be really, really, really cool. I'm not just saying that. And of course there are other interests involved. The school has an obligation to maintain minimum standards and your parents would like it if you came back from school with something to show for their money other than a titanium rhino horn coming out of your forehead and the ability to make a can of Fresca into a bong. Such was the genius of the Founding Fathers.