West Ham fans have been called many things down the years and some of it is justified but Julen Lopetegui has just learned something about them. Demanding, fickle, deluded, unrealistic, entitled – just a few words used disparagingly about West Ham United supporters in the mainstream football media. West Ham fans turn up week in, week out home and away in massive numbers through thick and thin. And they had done so for over 40 years without seeing their team win a major trophy until last summer. The Hammers faithful are often belittled by the press and rival fans for being so demanding and want…