well, im not sure whether it is a troll or not, simply because of it's sheer stupidity, but if it isnt a troll it's probably a little kid who doesnt know any better.
if it is a troll it is a little inconciderate, but i guess as brenjen says, it did happen in real life, still, not exactly pleasant thoughts. well, perhaps the kid, if he is a kid will learn a little for next time;)