My mom and dad never had a pre-nup, that I was aware of. However, by the time they had their first child, they made an agreement that who ever asks for divorce, they take the children. By the time I came along, neither one would ask for divorce. They felt safer in numbers.
But in all seriousness, I do see both sides of the situation. Especially if you have children. Then, it might even become more important then, as prenups can be more then just about money. It can also be about how to handle marriage problems. Agreeing to marriage counseling before divorce, etc.
If it was all about money, or just getting a prenup just to have one, then yeah, that would be a little bit insulting, and could cause you to question the commitment of the other person.