Yeah, that's just the legal angle. It's upheld every so often when a celeb gets upset about images in the press.
And yes, a lot of things are wrong and legal at the same time. Particularly wrong is the burden of celebrity that falls on the children of the rich/powerful/famous etc.
Apart from the fact that he was bringing up her "gayness," though, is the sheer effrontery of saying of someone he doesn't seem to know personally "If you asked Dick Cheney's daughter . . . she would tell you . . . ." IMO, if you were crude enough to ask, she would probably (and rightly) tell you to mind your own business.