I accidentally gave a roommate's cookie to a different roommate
What do you think caused this mistake?
I didn't give it much thought. The roommate's nickname instructed me to do so.
It seems that you made an honest mistake. You should take action to correct that mistake by replacing the cookie that you gave away. This will show your roommate that you meant no harm and they will respect you more for it.
You are a soft ass. Rude. I could of killed someone by mistake just return the cookie.
Well trying to right your wrongs is a good habit to get into. People are going to make mistakes, but you truly show the person that you meant no harm when you go out of your way to correct it.