Brutal? Now that sounds like a bit of an exaggeration.
CBP has the final say for admission of ANY person at the border, regardless of what visa or documentation they present.
Acting entitled won't get you far. You have to follow the rules, have your funding and housing in order well before arriving at the US border, and agree to the terms of the visa (i.e. not working, not immigrating). Also, you're 100% responsible for the content of the DS-160, and for understanding your own visa process.