MANCHESTER, England (Reuters) – Former Manchester United captains Gary Neville and Roy Keane accused Ralf Rangnick’s team of giving up in Sunday’s 4-1 derby defeat at Manchester City. United had competed well in the first half, going in 2-1 down at the break, but they looked demoralised after Riyad Mahrez scored City’s third and that attitude riled the two ex-skippers. “Manchester United’s response to going 3-1 down has been embarrassing. Ninety-two percent possession for City? They have given up,” Neville said on Sky Sports. “They are walking around the pitch. It’s nowhere near good enough. T…