^^This
That's because he feels by creating an 'Us & Them' environment he feels like he's the leader of the gang. He's happiest when he's driving posters against posters as this suits his twisted agenda. Sadly after nearly six years he's been unable to move on.
Strange most Chelsea, Leicester, Arsenal and Sunderland fans seem to live in harmony.
Sorry forgetting Saints (real saints) and Everton.

Had you not noticed it's all bollocks?