The obvious difference between your experiences and the person you're replying to is that he's residing there and you're visiting. You're right that your rights are far more limited when you're a visitor to a country crossing a border, but he and this thread are talking about what rights residents to a country have regarding the border.

My point was that Polish citizens do not get asked. This is different for Americans. US citizens entering their own country have to answer these bizarre and sometimes creepy questions.

At least not if from the EU.