What sort of balance of idealism vs. realism do/will you impress upon your children?

I’m having an awful time trying to phrase this. If you are a parent or intend to become a parent, do/will you teach your children idealistic morals or realistic ones?

For instance, most kids’ shows contain very cut-and-dried messages about how outer beauty doesn’t matter (but we all know there are some situations in the real world in which it come in to play, like job interviews, no matter how unfair that may be).

Should we teach our kids these realities, however harsh, or should we leave them to learn about them when they’re older?