Me and So were at Big Box retailer today and managed to pick up an item with no UPC barcode/price tag. Since we were only purchasing 3 items, including that one we let the clerk know we would just wait to the side while someone ran and did a price check (it was a large item and none of the items had the price tag are on them, we weren't just to lazy to go ourselfs!

).
Well a few minutes later the price check came back, we waited for the check out clerk to finish the current transaction she was working on, and then she turned back to us and rang in our 3 items and were paying when the customer that was next started voicing her disapprovement.
She whined to the gentleman she was with how some people are so entitled they don't think lines are for them. Then she told him that the store needs to train clerks to deal with pushy people like us that thinks the world revolves around them.
Now, this women was in line during the time that our price check was needed. So she should have been us wait in line, take our turn, and decide not hold up the line while someone checked the price.
So, my question: Is it a "no-no" to get back in line after stepping to the side to wait for a price check, a replacement, or whatever else after already waiting you turn?