Can't say I really have experience with other Christians, at least that I know of. The ones I have encountered have seemed sincerely concerned for my welfare. Well, at least in California. I grew up in Pleasant Grove, Ut and though some 80-90% were members and though not all were active, there was no real problem that I could say, aside from peer pressure.
Though, when I went to college and lived in SCL, I was actually afraid of other Christians. So many seemed so angry that those of us who were Mormon, were Mormons. I've been to General Conference and until I reached the Conference center grounds, I was afraid of who I'd run into and what hateful things they'd be screaming and getting into peoples face about. It was really scary and they always seemed to be at least one, you had to avoid around downtown SLC.
I did have one or two friends in my Jr. and Sr. High School years and they were as nice as anybody else. Other than that I'm sure I've had encounters with other Christians, I just don't know who they were. Mostly, nice people being nice.