The entire activity of going to buy a few things for around the house during the weekend is something that is performed by a consumer. This guy is exactly talking about you, but you aren't seeing it because your own internal identity isn't Consumer it's something like "guy who wants a chill weekend." However in the marketplace your identity is consumer.
What point are you even making?
We all have to eat, we all have to wipe our asses, we (mostly) all need to change the oil in our cars.
I don’t really see the purpose in describing the purchase of necessities as an identity.
I think we're just arguing semantics at this point. From an economic definition you, me, and everyone else who has to exchange money for goods and services is a consumer. I'm referring to consumer culture/consumerism, which wikipedia defines in a cleaner way than I can. Buying groceries period makes you a consumer, having a weird sense of superiority because you go to a specific grocery store is consumerism.
> In contemporary consumer society, the purchase and the consumption of products have evolved beyond the mere satisfaction of basic human needs,[1] transforming into an activity that is not only economic but also cultural, social, and even identity-forming.
[1]: https://en.wikipedia.org/wiki/Consumerism