I don't take pictures of anyone if there's an open seat within sight -- except for a few of those listed under the "Hall of Shame" tag. I also don't take pictures of elderly people, visibly pregnant women, or anyone who looks like they might have a disability. Of course, it's important to keep in mind that there's no way of knowing whether someone has a disability just by looking at them. ...
can’t blame these people, they look miserable. You’re having all the fun photographing them.