Maremia
Why be rude to the Poster? If you are shocked at something, you don't always have a response ready. Hindsight is a great superpower.
We have all complained, 'I wish I had said that.' Haven't we?
FAir enough. So now is time to return to the shop and ask to speak to the Manager.
This happened to me once, I was 16/17 doing a summer job at the local Coop. The manager was always 'accidentally' bumbing into me, touching my bottom or my breasts (60s, it was almost expected then). One day I droppe a jar of pickles when filling shelfs and he laid into me, calling me everything under the sun. The shop was very busy and I was paid (in cash, the previous evening). So I grabbed the chance and explained loudly to all about his disgusting behaviour and that he should be ashamed - and stick his job. Took my apron off and walked out of the shop, with applause from all the customers. THAT felt great!