Fair enough, but where do you draw the line? What if they ask you for ID for a burger? What if they ask to see your browsing history? Or your medical history? At what point is "I will never give that to you" or "Ha ha, no" justified?
At some point you just buy your burger elsewhere. "Can I see ID!" is absolutely across that "go elsewhere" line. No need to be rude, just stopping giving your money to them.
These questions are missing the point. The person you're talking to has no control over the policy so any response directly to them is not going to impact that policy which means the objectionable nature of the policy and your desire to change it are irrelevant. If you're so deeply offended by the question, either stop patronizing the business or voice your criticism in a more constructive manner like trying to reach out to corporate or organizing some consumer action. Don't go the easy and lazy route of attacking the messenger.
No, I see the point, I just don't buy the argument that people working retail have been stripped of all agency, and so therefore your reaction to them must always be a calculated indifference. At some point, you've got to stick up for your dignity. Maybe it's not this case, but it's not far off.
