Guess what? While you have your right to an opinion- you are wrong from an ethical and legal standpoint.
It is perfectly legal to take a photograph or record video on public property, regardless of who is in it. You can take a photograph or record video of anything visible from public property. (Note that most states have expressly ruled that people do have a right to privacy under their clothing; so you are allowed to take a photo of the hot blonde; you are not allowed to take a photo up his kilt. Taking a photo of someone during a wardrobe failure is a grey area legally but is morally repulsive.)
I mean, it’s good not to be an ass, but being allowed to film in public areas is very important to preventing crime, particularly from public officials, and is a keystone of our democracy.
The general rule of thumb is to dress and behave in public like someone had a camera on you. Honestly, it makes the whole world a better place.