You're making a fair point, of course.
Not sure I'll capitulate, though.
In this case, the pictures were so obviously 'sneak attacks', not sure why they were even posted, except to give evidence to the claim: 'I was
this close to Catherine!'
On the other side, such pictures should never be a source of comment imo. How someone is dressed, what their expression looks like, are they tired/angry/rude, none of that should be batted about. Such commenting suggests the person targeted has some sort of responsibility to be 'on' at all times. It's a picture taken unawares, that's enough. How would anyone fare with a randomly taken photo?