Wah! Call police summore! This one must be the type last time school days everything also report to teacher one.
My guess (from the pic) is that the two men needed a place to eat while the girl was just sitting there chope'ing place for friend. Don't say them, I also get a bit irritated when people chope seats like that. I guess there's nothing wrong, really. It may be a cultural thing which many other societies find unacceptable.
You try to chope seats overseas (be it in a Western country or certain Asian countries) with your bags in a fast food restaurant, etc and the next thing you find is your bag on the floor.
Anyway, why are you people even bothered with STOMP! IMHO, it's one of the most bo-liao portals ever known to mankind, meant to serve the most bo-liao people ever known to mankind.