I always found people who take pictures with the middle finger as a trashy gesture. I don’t and never know who they’re trying to tell off but it’s out of no where and just stupid. It doesn’t offend me, I just find it a pointless gesture and therefore - trashy.
I flip the bird for a picture if I don’t want my picture taken.
Pissed off an acquaintance in high school because she wanted to take my picture, I didn’t want my picture taken, she did it anyway, and I got my middle finger up just as she pressed the button.
She was pissed because:
This was in the days before digital photography so there was no option to delete the picture.
She was taking pictures for a photography class, the grade included developing the roll, and she would have gotten in trouble if that was included, so she had to start over (or so she said).