I've met a lot of natural straighties who have curl envy. Usually they assume that I, as a curly, must long for their straight hair. (I get why they'd think that. Society trains us to dis our curls.)
After complimenting my curls, they often say something like, "You always want what you don't have, don't you?" or "The grass is always greener on the other side, isn't it?"
These days I respond honestly, even if it sounds smug: "No, not really," I say, "I love my hair." ... And it's true. I have a strong bias toward every curl type in this world. All these years later, it's amazing to think there was a time I DIDN'T like curls! There's some seriously amazing curly hair out there. I LOVE it on men!
... At the same time, I hope those "grass is greener" thinking straighties can learn to accept the beauty in their straight hair.