Privacy matters in the US are state court issues, but state courts have ruled that, for instance, persons in a booth in a restaurant have an expectation of privacy, even though the restaurant is clearly a public area.
Laws against voyeurism, though, don't always depend on the individual being recognizable.
He'd probably be doing a perp walk by now if he were in Texas.
Typical wording (in this case, Pennsylvania):
It shall be unlawful for any person to enter upon the property of another and secretly or furtively peep, spy or attempt to peep or spy into or through a window, door or other aperture of any building, structure, or other enclosure of any nature occupied or intended for occupancy as a dwelling, whether or not such building, structure or enclosure is permanently situated or transportable and whether or not such occupancy is permanent or temporary, or to do the same, without just cause, upon property owned by him and leased or rented to another under circumstances that would violate the occupant's reasonable expectation of privacy.
The loophole here seems to be that a person can spy on others as much as he wants, as long as he owns the property he's sitting on.