This seems a perfectly reasonable thing to do to The Sun.
The Labour Party has come over all peevish because Rupert Murdoch's tabloid has decided it isn't going to support Labour any more.
Perhaps a better question to ask is why an ideologically committed right-wing newspaper that worshipped Margaret Thatcher, and which comes from the same stable that gave Fox News to the USA, should find it so comfortable to support the Labour Party in the first place? Shouldn't Labour people should be more troubled by the Sun's backing than its opposition?
Meanwhile, Tories gather round the piano: