Who does this regularly when washing clothes?
I've always heard of it being a thing but I only ever wash things separately if I think they might run (ie. dark stuff that hasn't been washed before). Otherwise, stuff that is regularly worn just gets bunged in together and then into the tumble drier and we've never had any dye disasters, my whites are still white, etc.
What am I missing? :D AIBU and a terrible human being? Do I need to be shown the light?