I posted something very similar on here last year after a visit to Ibiza - as we sat eating lunch in the castle in Ibiza old town, a group of young women spent the entire time we were there, maybe an hour and a half, in turn posing for photos next to a plant. Each time one went in for the pose, they'd pass their phone to a friend to take the pictures. It went on and on. The two things that really struck me about this were: 1. all the photos seemed to be taken with the subject's phone, so nobody had any photos of the people they were actually there with, and 2. If they'd turned around, there was an absolutely stunning view right behind them.
I felt old.
These days, go anywhere in the world with a pseudo famous landmark and watch the same thing. I've been travelling long enough to remember people being present and taking in the experience. Now it's literal queues for the perfect spot to take 100 near identical photos of themselves, and choose a few later for social media.
I've never understood the need to take a picture of yourself. I know what I look like--I don't need a photo to remind me. The rare times I ever even take a picture of something, it's because that thing is interesting or unique, and I'd like to look at it carefully later.