Actually friendly, like go out of the way to help you friendly.
One counter-point: not sure if this is still the case, but a few years ago Provo, Utah (just south of SLC) used to have the highest per capita usage of anti-depressants. Interpret that how you will :P
I am not a minority race, but Utah is becoming quite diverse. My personal opinion is that it is a welcoming place and is a great place for families to raise their children.
Was curious about this, as it didn't seem to fit my limited observation from my last few trips to Utah (which is again, a lovely place). The Census bureau government says Utah is >91% "white only":
Which is likely more diverse than Utah was in the past, but could not be fairly compared to California as "quite diverse" given the same number for California is 73%: