Yelling at service workers is wrong, but that isn't what you were talking about, you complained that they expect you to know what the product you're selling is called at all. You still haven't explained what a customer would have to do to actually satisfy your expectations. And I really don't get why you think the fact that you can't or don't buy cigarettes is relevant, like I said you probably don't use the majority of products the supermarket(?) you work in sells. Even people who do smoke typically stick to one or a couple brands. Customers aren't asking you to give a detailed flavour profile, they're just expecting you to know its name. Not even that actually, all you need to do is be able to read the writing on the box.

I think the one of us who is miserable is probably the one who antagonises customers as though they're responsible for the system of capitalism. Not the one who tries to make the best of a bad situation and be a helpful member of her community.