Fallbrook is a nice, quiet place. It is a conservative town but I think that is common in semi-rural areas. You have to ask Alan about the culture/vibe part, I’ve never really seen it as much of an entertainment mecca, just a sleepy avocado town with some nice houses and pretty landscape. Your ultra right wing friends that live there may have migrated there in the 1980’s when it was somewhat notorious because one of it’s residents.
As the base for the Grand Dragon of the KKK, it wasn’t exactly a “diverse” place. It’s been 20 years since that guy went to prison and nothing like it exists today to my knowledge but some people take a while to forget. I think the effect of the 1980’s have faded in the twenty years since but I imagine there are still some folks leftover.