You can assume it's the USA and that I'm just dead wrong, but the third word of my profile specifies where I'm from and you'd find that this Dutch constitution matches the comment's contents
Equal protection is indeed not the same as equal treatment. No, it really does say that everyone shall be treated equally so long as the circumstances are equal (gelijke behandeling in gelijke gevallen)
I didn't assume, that's why I started my comment with "if by what you mean." Good to know that you were referencing a different place, but it's unrealistic to expect people to delve into your account bio to understand what you intended by "our constitution," especially when the parent comment also contained no geographic or cultural references. Perhaps you know the parent commenter and know that they share your geography? If so, that would also have been helpful context.
As an aside, I'm curious by how that language in the Dutch constitution actually works in practice. Is it just a game of distinguishing between situations or people to excuse disparate conduct? It seems like it would be unworkable if interpreted literally.