The way I use my dominant function is by people pragmatism. I feel like I'm split between what people could do and what they are likely to do, which can lead to more conflict than what a Fe-dom supposedly engages in. I lean more heavily towards what they're likely to do and I move accordingly. I don't feel particularly idealistic or optimistic towards people, but since I realize most of us kind of bumble around in life or for large periods of their lives--basically learn as you go (and this goes for me too, I'm not excluded in this) there is a sense of forgiveness towards our human imperfections. It's not enough to make me this magnanimous gracious person I want to be, but enough to take people in stride and be tolerant of certain negative behaviors in this kind of "Well what did I expect? *shrug*" sort of way.
So I may get confusing right now, but the way this translates out into real life is I kind of go between dealing with our animal brain and our higher brain; between instinct (fear, pleasure) and our intelligence and thoughtful consciousness.
That means that people's treatment of others is oftentimes dependent on if they like them or not, whether you look like and/or act like them, whether you think like them or not, whether you can make some personal relevant connection to them...basic simple stuff. So basic that people don't even think about it or others disregard it's importance. I really can't help that I think about this stuff, it's natural to me or it became natural at some point and it's something I enjoy doing so I do it.
There's really no strict way this comes out in everyday life, I'm both fastidious in how I think about this and casual in my output, I suppose, I'm not good at self-evaluating.