Therefore, it's impossible to have students from hundreds of countries at BYU. Here are the facts from both universities. For brevity's sake, I'll just limit it to white and international students:

UofU : 22,632 white students (71%), international 2594 (8%). It doesn't say how many countries are represented as far as I can see. As one of those international students, I've never felt like I've been living in a bubble. I've interacted with others from almost every state and from a diverse number of nations (seriously, debating whether the US can actually make decent gelato or not with some of the Italian students is hilarious. I vote yes, they say no. Eh, that's a debate for another time)
link: http://diversity.utah.edu/uploads/data/pdf/2012-2013-report/Diversity%20States%20Web%20Report%202012-2013.pdf

BYU:

White 86%
BYU students come from all 50 states, the District of Columbia and 110 countries. Subsequent demographic figures represent all daytime students as of Fall semester 2012.

All Daytime Students Fall 2013
Students from the United States 94%
International Students 6%

Link: http://yfacts.byu.edu/Article?id=135

I've never been around BYU long enough to get a good impression, so I wont say whether you guys live in a bubble or not. However, I would suggest not throwing words and insults around without actually doing some research or getting multiple points of view.