It's all down to jealousy and nothing more.
Imagine how it must feel to them having to witness the joy on the faces of 'the kopites' as the redshite beat Real Madrid, Barcelona, Juventus, Inter Milan, AC Milan.. and what of the peoples club? The peoples club just doesn't get to play in matches against such teams. The fans of these teams have never even heard of 'everton'!
Imagine knowing that while you're sat at home under the stairs, pretending its not happening, 'da redshite' sit on a bus parading the European Cup around the city. Imagine knowing that this has happened to the team you despise the most - not once, not twice, but - 5 FUCKING TIMES. And your club has NEVER, EVER, EVER, EVER won it. It must turn their stomachs with bitterness.
They have to content themselves down the years with witnessing the talents of Big Dunc, Cadamateri, Jeffers, Yakubu, Vellios and Naismith whilst their hated rivals enjoy the likes of Fowler, Owen, Gerrard, Torres, Suarez and Sturridge.
They have their 'best' season in years.. and LFC only go and thrash them 4-0, sit 11 points ahead of them and challenge for the league title..
Is it any wonder they're so bitter?
Fuck them. Forever in our shadow and its never gonna change.