Yeah, I just think that when people post on certain stereotypes, you really have no way of knowing where they are coming from. Is this something they focus on? A one-time occurrence? Do they have concerns with people in that group? If you don't know the poster, you don't know their intention, ya know?
Is it important that this person has a cellphone or what they are wearing? Not really. Without knowing the poster, one doesn't know how to interpret the comments, that can come across as stereotyping one particular group, or showing a disliking or disdain of a group, when really, the focus should just be on having to wait in line.
Of course, I am probably guilty of stereotyping the person with the hummer who takes my parking space and feels entitled while drinking their soy latte, but, eh......
I am also aware when I shop that someone could look at my items (sugar-free this and that) and roll their eyes to the back of their head, or when I am having a hard day and willingly buy junk food, they may be "tsking" under their breath. I guess I feel that it is more acceptable if it is somene from the group I am representing, i.e., another obese person, etc. Sort of like how your family and friends can tease you, but others cannot.