If you're not talking about attraction, then what does it matter? I really could care less what they look like- dark or light- all that matters is personality when it comes to social interactions. If you're talking about getting married to that person, then i think it makes a little more difference.
Also, I agree about the well-groomed aspect. I think if someone is darker, its harder for them to appear well-groomed. I think lighter people have it easier. One of my friends is darker but since her skin is not uniform in color, she looks unkempt. My other friend's skin is also blotchy, but since she's light skinned, it doesn't look as bad. But you know, i have another dark skinned friend and she looks pretty, clean and well-groomed, so it might just be that first friend is not very clean...