If X and Y were two ends on a sliding scale...
If beauty and intelligence were two ends on a sliding scale, you're retarded.
If beauty and intelligence were two ends on a sliding scale, you're ugly as fuck.
If beauty and intelligence were two ends on a sliding scale, you're the definition of beautiful.
If beauty and intelligence were two ends on a sliding scale, you're the definition of intelligence.
Either way, you're calling someone ugly or stupid.
Obligatory "Works every time"