The article discusses morality and ethics versus personal preference, but that's just high-brow talk.
The point is that today, once someone photographs you, you cannot possibly know where he will post or publish your photo. And yes, that's creepy.
Decades ago photographers maybe showed your picture at a gallery or exhibition. Today everything goes to Instagram, and someone will probably ridicule me for some small thing (a stain on my shirt?), and maybe thousands will pile on, and maybe everyone in my social circle will see it? Embarrassing.