The problem is that your response is precisely what the corporate decision-makers rely on to insulate themselves from criticism.

That doesn't mean that you are wrong: there is no point protesting to a cashier. My point is that there is no realistic or effective way for us to actually communicate to the corporate decision makers that rule our world. This becomes even more true as corporations consolidate power, which is precisely the "enshittification" that Cory Doctorow has been writing about.