siteism
A 'sitist' is a person or entity (corporation, website etc) that discriminates against websites supporting such a person or entity, based on unfounded assumptions.
Jagex (the makers of the MMORPG, Runescape) doesn't recognise Zybez.net as a fansite for unfounded reasons (apparently there are bad advertisements on Zybez, which don't actually exist), therefore Jagex are examples of siteism, referred to as a sitist.