Memes

This. I do it by the weight of the fabric itself. Towels blankets jeans all go together cause they take WAY more time to dry. Lighter things like tshirts and undergarments and things go together cause they would roast in the dryer with the thicker materials. It also evens out the weighted distribution on the washer barrel.

"The basic rules are to sort clothes by color and fabric type. Sort clothes by color to avoid bleeding and dye transfers. Sort clothes by fabric type to avoid damage in the wash and use the correct wash cycle."

If you know your stuff won't be bleeding, there's no reason to do it by color and to protect the fabric and machines, you should do it by the fabric material itself.