A well regulated militia being necessary to the security of a free state, the right of the people to keep and bear Lego bricks shall not be infringed.
Be as it may, the simple act of a country denying entry isn't a human rights violation.
That's right. Nor is simply asking for email addresses or phone numbers.
It may be. I have several e-mail accounts, only one is in any way tied to my meatspace identity and I take precautions to keep it that way (privacy extensions, logging from a virtual machine, etc). If I give them one of those, such a tie is created, hence - my privacy has been violated.
Another problem: I don't have twitter account. If I get denied access to USA because of it, wouldn't it violate my right of association? I made a decision to not be associated with Twitter and the government punished me for it - IANAL, but it sounds like a textbook definition of violation.
If you push the "extra ice" button on the soft drink vending machine, you won't get any ice. If you push the "no ice" button, you'll get ice, but no cup.