>>213998538 (OP)
Blonde hair and blue eyes are rare in most places and hence the rarity gives it value.
It might also be associated with higher classes.
And just at the end of the day, there are better looking ethnicities than others.
The difference between a croat and a pole might not be great, and preference becomes a matter of taste, but then you have objective ugly races like abos.
Also, looks can be enhanced or degraded through care, beauty products and fashion and culture relativism. For example, Afghans arent an ugly people, but their rural lifestyles and thirdie aesthetics gives a perception of them being ugly.