A drunken man labelled gay for liking the "rubbish" music of industrial metal rocker Marilyn Manson has been jailed for at least 18 months for killing his accuser with one punch.

After knocking his fellow-drinker to the ground, Grant Adrian Edmonds said: "I told him what would happen, I told him not to call me a poof."

In jailing Edmonds in the NSW District Court in Sydney today, Judge Anthony Blackmore spoke of the need to deter others from alcohol-fuelled violence around licensed premises.

Edmonds, 36, a coalmine labourer, pleaded guilty to the manslaughter, by an unlawful and dangerous act, of Paul John Siniawski, 48, outside a pub near Mudgee in central western NSW on October 2 last year.

Mr Siniawski, who ordinarily lived with his family in Pitt Town in western Sydney, was working in the area installing satellite dishes.