"I do not intend to offend you, but your phrase, "Our town and HS are very diverse,...", shows that you live somewhere where PC "values" hold sway."
Last year my oldest daughter & I went to Boston to look at BU & BC. I loved BC, and my daughter did too. We attended an open house for prosepctive freshmen and listened to the admissions representatives as well as about 9, really well spoken, bright students talk about the college. This group of 9 white, catholic kids touted their "diversity."
Our city in Westchester has 1 high school, about 3,100 students. We are very diverse. I don't mean that in any PC way, but only that economically, religiously, ethnically, racially our students come from all groups. There are many diplomatic residences in our city and we have lots of embassy kids too. We have illegal Mexicans and Irish and descendents of the french Huguenot settlers. A new Mormon temple is opening in a few weeks. Our city is mostly Catholic & Jewish (typical for NYC), but my son has a Quaker friend and one daughter has a Mormon friend, and one has a, get this, zoroastrian,(her mom is a surgeon at our local hospital). Our city is about 30% black, and 20% hispanic. Westchester was historically republican, but for the last 30 years has leaned more democratic and liberal (Hillary took our county).
My daughter loved many things about Boston College, but said she "had never seen so many white kids in one place." I had to laugh, but agreed. I've worked at a Catholic college for 24 years, and many things there resonated with me, but I knew that wasn't the place for her.
Diversity is not only a "PC" thing, but when you've been exposed to many different types of people you notice the lack of it. Our Swedish exchange students mentioned that over and over as one of the things that impressed them about their trip.
I believe I've heard the phrase "melting pot" way before "diversity", but they mean the same thing.
I hear you.