A day in the life of a PSR worker

I took a girl who is 8 years old to the store today. I wanted to see how well she could behave. I told her that...so you think she would at least try? No.. VERY wrong. She would not listen to a word I said and I needed to go to the bathroom super bad. I told her I needed to go and that we would come back and look at the Halloween stuff after and she said okay. On the way to the bathroom, she stopped at everything she saw and it took my like 5 minutes to get her to come with me.
After the bathroom - where she needed to blow bubbles in her hands for a few minutes while ignoring me, she stopped by every toy she saw (which is not part of the rules). I basically had to force her to come with me. This does not look good to a person just standing by. I had the weirdest looks like I was kidnapping her or something. I told her that we can't look at the toys unless she can listen and do what I ask her to do. She got super mad. We went out of the store and she called me a 'b-word' in which she actually said 'b-word' instead of the actual word. Progress right?
And her way of getting back at me was insulting everything I had. She told me she thought my car was ugly and that it needed to be cleaned because it smells.. on and on. I know my car doesn't smell - so no offense was taken. ;)
Where do kids learn these things?