I would think he is just another frustrated fan, like the rest on here.
In an ideal world, we would all be able to put our point across in an adult manner, but sometimes the feelings you are writing about get the better of you. I think we would all benefit from trying to read the sentiment rather than the exact words on here sometimes. I, for one, try not to look at who posted what until after I have read it, it gives a better sense of perspective.