One should always count there change and no reason for them to get upset because we do. Many cashiers today don't even count what they give you. They just give you what it says and put it in your hands without first checking to see that they themselves counted it right.
Speaking of cashiers I have a couple funny stories to tell. Several years ago a gent was at Walmart and paying for his merchandise with cash which were all two dollar bills. The gal refused to take it saying it was not real money because we did not have two dollar bills. So we proceeded to tell her it was real money and it was good. She still refused saying we were wrong....yet we were born in this country and use the money all the time. We had to deman that a floor manager be called. She refused. We refused to move until a manager was called. One finally came and told her it was real money. I traded the two dollar bills from that gent that day and gave him bills she understood. Point being these cashiers are trained only in $1,5, 10 and $20 bills. Most of them cannot count the way we learned when we were in school.
Another incident happened a few years back when speciality one dollar coins were made and I tried using them again in Walmart and the gal ....different cashier refusing to take them. These were duplicates of ones I save. We went through the same routine again and the gal was told it was American money and to accept it.
It would be nice if retailers trained there employees on all the various money pieces we have in this country. And also trained them on counting change back to customers instead of just putting it in there hands and trying to rush you out of there.
I always make sure to count what they give me back and don't care if they get upset that we do.