That is why I put a safety pin on my socks before putting them in the wash....that way they stay together and I do not get mismatched socks because the wear patterns on the left and right foot are different so you can rotate your socks if you can identify which is which and get the them to wear evenly so that when you seek replacements for worn socks, you wont have one nice one and one really worn one ....they will be about the same amount wear and you get your money's worth of use out of each one.
I am sure I am not alone in doing this??