We just had a conversation in this vein with our 12 year old nephew yesterday!
Him: cleaning his room, picking up One.Sock.At.A.Time. and bringing it over to the dirty clothes pile across the room.
Me: It's going to take you a long time to get this room cleaned if you keep bring over one sock at a time. Why wouldn't you just grab ALL of them at once and bring them together?
Him: (smiling and continuing to pick up and carry one sock at a time) "I don't know, hahahaha"...repeat, repeat, repeat.
Me: (after watching 3 more trips, and I'm yelling now) "It's NOT a suggestion! WHY do I have to yell and be mean before you realize that I'm being serious??!!"
We are very big on phrasing things in a way that makes the kids think about what they are doing, and having a chance to self-correct. Clearly the 12 year old has issues with this. It's a work in progress, but we keep at it because it's a valuable life-lesson that everyone should know. It would be easy to say "Pick up everything and bring it over at one time", but this is a child who has been conditioned to "do" and not to think. We are trying to change this, and it's been two years now. Incidents like this happen multiple times a day, and at this point, I think he is messing with me lol But it gets frustrating. I try to be patient, but when it's the 5th time that day and he STILL isn't paying attention or "getting it" and I KNOW he is capable, I yell.
If I don't raise my voice at that point, I will lower it and speak very slowly - "Pick. Up. ALL. Your. Clothes. and bring them over here, in ONE big pile." I don't think it sounds any nicer or better than yelling, TBH.
either way, NOT child abuse!