Its due to VGChartz at its core being a sales site.
Being a sales site means you attract a certain kind of user. You automatically bring a competitive environment and a competitive environment brings an abundance of fanboys and trolls.
Fanboys and trolls generate hostility, which amplifies when you have a site centered around sales. It makes people overly paranoid and over defensive.
Granted the majority are generally a nice bunch of people, the problem is the nice guys can be easily drowned out by one loud, annoying fanboy/troll. The fanboys and trolls paint a negative image on the company of preference. There are certain members in each fanbase that do this, and they consistantly try to put down the competition.
