LACs are small and often--not always--located in rural, isolated areas. The smallness makes it important to understand the dominant social culture at an LAC. Not important at larger schools due to the ease of finding diverse groups and diverse opportunities in significant numbers.
An old saying: You can make a large school small, but you can't make a small school big.
That's ridiculous -- or at least ridiculously biased in favor of large universities over SLACs (it sounds like ASU propaganda). Actually, at smaller schools and at rural schools it's often easier to venture out of one's comfort zone and meet "diverse" people outside the 'dominant social culture' precisely because the school community relies on itself for entertainment, because it's easier to connect with other students on campus, and because there's a smaller community and people are more open to continuing to befriend new faces. Compared to big urban schools where people make a group of friends and drift off campus into the city with them.
An old saying: you don't need more friends than you can make at a small school.
No, of course I just made that up, but it's as valid as yours.