this is an example of singling out single traits and equating them to overall attractiveness or beauty, which is misleading. this is often assumed with the stereotype of those with blue eyes and blonde hair though technically false.
this does not take into account the real question, "is the person appealing besides thier coloring?" sometimes and sometimes not. they may have an unattractive facial structure, eye shape, nose, body, even skin or hair texture.
blue eyes can also look cold and even boring, especially very light blue eyes. blonde hair can look washed out and equally weak or sickly.
also, why are there so many ugly people with any variable shade of eye or hair color? um, because it's just "color."