They played and fucked off without saying anything in the early days, probably cos they were a little bit intimidated, Hooky often had his back to the audience in the early days of Joy Division.
The best gigs for me is when they started talking to the audience and ripping the piss, this wasn't something that started in the late 90's gigs or the gigs in the 2000's. Barney and Hooky's banter started as early as 82/83 if not before in some cases like Berlin. If they'd kept quiet and refused encores it would have gotten rather boring IMO.
Barney coming on at Reading in 98 and giving it "we're new order you're the fans, let's rock the fucking house" was fookin magic, as was the gig. One of the most memorable I saw. Most of the people on here who were at Finsbury thought it was great.
As for why were they so surly, it's been answered above, drink, drugs and Northern humour.
Fuck, I miss seeing them live!