Supersonic Tech-tonic

Someday I'll get something that will let me update posts via airwaves, because God forbid I remember anything long enough to get out of the shower and get dressed.
Part of what I was musing over (in the shower) was this:
If we accept, for simplicity's sake, that phenotypes are solely the physical expression of your genotype, then why do people seem to choose those that look like themselves? From an evolutionary standpoint, it would seem more beneficial to choose a mate who looks less similar to yourself to increase the gene pool and the chances of mixing beneficial gene mutations.
Is this just a remnant of social traditions and geographical proximity? If it were the case of geographical proximity, then in an age of global transportation and more people moving away from their hometowns, this should have disappeared. To some extent, we will choose phenotypes similar to our own simply because phenotype is partially linked to the environment: since most of us stay in our country of origin, then we're not going to see radical phenotypical differences, but there is still enough variation to choose between even in relatively small countries.
If it's a remnant of social traditions, then why haven't we gotten past that yet? Get a move on, people!

Sadly this is mostly moot because I can pretty much explain everything I've brought up, just not in the context I've given.

I've also always wondered where everyone else is going, when I'm careening (not really) down the freeway. It's strange to see that in such a techno-communicational age, where you can contact anyone in the world in a matter of minutes, that I don't even talk to my neighbors much. It's very oxymoronic to live in a world where we have global communications but at the same time are so isolated.

One last thought: why, in this super-information age, does everyone blindly refuse to use what resources are available to them? Kids at work keep asking me what seem to be the most blazingly obvious things, and I just want to hand them an encyclopedia, or for the technologically literate, Wikipedia. Why not learn when it's all at your fingertips? If you want to know about something, look it up!
Which just reminds me that Wikipedia is horrible for my procrastination, since I will gleefully spend hours clicking from link to link and end up on something that's a far cry from my original topic.

TLDR: People are weird.