Calling yourself uncomplimentary names will not help. Making a mistake does not make you an AH.
Recognising you need a system change is a very good observation.An AH might not do that.
Among the most dangerous,gun wrecking,injury causing reloading mistakes is grabbing the wrong powder canister. Loading a fast ball pistol powder in the hopper instead of Win 748 to load rifle cartridges,for example.
If there is more than one powder canister on the bench,you can grab the wrong one. Murphy's law.
This time,it was only spent primers.
I suggest only one powder canister on your bench.
There are other containers to use for utility containers.
For no extra charge I'll make another suggestion. This is an SOP from a chem lab I worked next to.
When you transfer your powder or select a powder for a load,read the label out loud,twice.Something about reading it aloud requires the brain to be more engaged.
There is another post up about an ND with a revolver..IIRC three people opened the wheel and called it clear before the ND. One nickel plated round hiding in a stainless gun. Complacency,seeing what you expect to see.Going through the motions.Getting distracted.
It seems hokey,reading the label out loud. Its a good idea.