Leo Varadkar's partner Matt Barrett says some people will "celebrate" the violation of another's privacy.
It comes as a picture was taken of the Tánaiste without his knowledge at the Mighty Hoopla festival in London and was then widely circulated online last Saturday.
It drew huge criticism, with many in the entertainment industry pointing out that this was the weekend the cancelled Electric Picnic would have taken place.
In a letter published in The Irish Times on Saturday, Varadker's partner, Mr Barrett said
“The notion that the right to privacy is one which is conditional on the attitudes, sensibilities and prejudices of another” is “both ridiculous and dangerous”.
Mr Barrett wrote: “The individual who photographed the Tánaiste does not have a right to violate this [right to privacy] merely because she believed it was justified and consistent with her own beliefs about what constitutes appropriate behaviour.”
