No, they are 100% correct. People who want to enter the country are not visitors in the US, by definition. And the comment didn’t say that even aspiring visitors to the US have no rights - it said they have no right to enter the country.

Sure they do, just not the right to enter the United States.

They didn't claim visitors in the US don't have rights. They -- correctly -- claimed that border agents can refuse to allow entry to visitors for any (or no) reason.

For comradery, I'm loving where this is going. I do wish we more consciously accepted that all persons have inherent rights. Looking forward to a world gov that tries to do good things someday... a la Bicentennial Man.