I will pass on one trick for mating socks after washing:
When you take them off, you safety-pin them together.
Socks now mate for life - no more orgies in the sock drawer. Kinda sad, actually…
My only rule is that the colour of my socks must match either that of my t-shirt, shirt or pullover.
This may lead to my looking for the appropriate pair of socks for some time every morning. I’m fine with that because wearing colours that match is very essential to my psychological well-being.
Evil. 
OMG… Kirk and Bones are here, too !!!
I match the colors of my bookmarks to the covers of the books I’m currently reading.
I understand.
This thing about each sock always having to go back on the same foot is new to me.
My only sock fixation that I can think of is that I dislike wearing almost-but-not-quite-matching socks, but I’d be surprised if that wasn’t typical of most people. I usually wear the lowest cut socks I can find, like ankle socks or lower. So if one sock doesn’t go above the foot at all, and the other one goes a centimeter further up towards the ankle, it’s not good. If one sock is a very thin summer weave, and the other is thick, I don’t like it.
If I do inadvertently put on mismatched socks, it’s a very low-grade but continuous nuisance, not unlike when I need to trim my nails but forget to do it for a day or two. (As a guitar player, I might find it more of a problem than most people do.)
I had a boyfriend once who wore nothing but white tube socks. But he could tell his right socks from his left, and was all about how the ribbing matched, and wide elastic v narrow elastic. I tried once to help him out during exam time by doing his laundry but since I failed so miserably at noticing the tiny nuances of his socks I never was "permitted"to do it again. (Ha!)
Now in this more of a marriage -ype relationship I try to match up husband’s 4 different brands of black sport socks. I end up with mis-matches because of the cotton content, the ribbing, etc etc. He doesn’t care.
I give up. Men, pair your own socks!
I agree with everything in the OP but not the follow-up post about how to fold socks. I tried folding or rolling but I like to be able to throw them into a basket and later a drawer and not have to refold them repeatedly. I really don’t think that teeny bit of extra elastic stretching makes socks die any faster. They are far more likely to get holes or just disappear in the laundry first.
I really hate wearing socks in bed, if I try to do it because my feet are cold I somehow manage to take them off in my sleep. I do the same thing with gloves. I’ve tried wearing gloves over hand lotion to combat dry hands and when I wake up both gloves are off, buried in the covers somewhere. Same thing happens with wrist splints, ace bandages, etc. I hope I never break an appendage because I think I will somehow manage to remove the cast in my sleep.
I am never without socks unless I absolutely have to. I wear them out of the house, around the house, to bed, any and everywhere.
Unless I’m walking from my hotel to the beach you will never see me in flip-flops. I don’t know what it is about me, but I just cannot stand the feeling of being barefoot.
My rules about socks:
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The tighter the better. I think loose socks are not only terribly uncomfortable, but they look trashy/dirty
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I cannot stand it when people’s socks don’t match! I have a bit of a fetish for girls in socks, and when I’m out in public and see socks that don’t match it drives me nuts
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Kinda-sorta the same with feet in shoes with no socks. It’s probably the barefoot part of it, but I have no idea how that’s comfortable!
-I have house socks (really small and tight) and I have going-out socks (generally higher on the ankle) and I really prefer not to wear house socks out, but sometimes it happens
- (see number two) ankle socks FTW, but over-the-knees can be nice too. Also argyle is the king (queen?) of patterns
I have designated bed socks.