It looks like you have stumbled upon the grand conspiracy of Internet messageboard moderators to undermine the Chelsea Football Club.

You've finally exposed us. We all hate Chelsea. Our life's mission is to undermine any vestige of support for football clubs based in Chelsea with our vast moderating powers, thanks to an event in medieval times that involves a gardening instrument, a Chelsea noble lord, a porcelian toilet and an overweight corgi. We hates them, those Chelsea players. Our precious.

Or the other likely explanation is that football fans tend to see bias in others when there's actually none, largely due to their own inherent biasness towards the football clubs that they support. But that's just crazy talk.