They can exclude an adult for any reason they want (in the US at least), as long as the reason isn't discriminatory against a protected class (for example, they

They can exclude an adult for any reason they want (in the US at least), as long as the reason isn't discriminatory against a protected class (for example, they can't exclude someone based on their religion). Other than that, they can exclude you for any reason they want, or no reason at all.