Jack Costello, 44, grabbed Jason Taylor at random after the victim got caught up in a minor exchange of words with another man for politely allowing a young woman to get served before him.
Costello initially put his left arm around 23-year old Mr Taylor's neck as if to speak to him but then bit down on the victim's ear before pulling him towards the floor.
Then as onlookers tried to pull him away he adjusted the grip he had on a glass flute and the thrust it into Mr Taylor's neck.
The victim who was not causing any trouble backed away but he collapsed bleeding heavily from a neck wound.
He died in hospital nine hours later with tests showing he suffered a fatal injury to his jugular vein.
At Preston Crown Court, Costello, a father of four who lost his right eye in 1996 in unknown circumstances showed no emotion as he was found guilty of murder after a five day trial.
He was ordered to serve a minimum of 19 years in jail.
He had a string of convictions for violence having been jailed for seven years for drug dealing in 2000 and then six years for a £100,000 arson attack in 2008 after he poured petrol through the window of a family house and set it on fire when he lost his temper over a children's Playstation game going missing.
Judge Mark Brown told Costello: "This was undoubtedly mindless and unprovoked violence of the worst kind on a relatively young wholly innocent man who was doing no harm to anybody.
"I have no doubt his family ave lost a decent completely dedicated person and family man of whom they can be truly very proud.
"The aggravating features of this case are that this took place in a busy bar in front of a lot of people, the use of a weapon and you were affected by drink voluntarily.
"This was a whollly unprovoked attack on Jay Jay who was younger and much smaller in stature. The intention was really serious harm.”
Mr Taylor's death last January 27 occurred just two months after Costello was given a suspended sentence for assault and driving whilst banned.
The victim – known as JayJay – and who was due to start a new job at Iceland supermarket, had been playing ten-pin bowling with his friends before going to the Esco-Bar in Darwen, Lancs to meet his girlfriend.
Costello had been at a party at a local Conservative club to celebrate his son Dylan's 21st birthday before going to to Eso-bar with Kayle Smith, 30 – nephew of Costello's ex-partner Sharon Kitchin.
Trouble began after Mr Taylor who was described by his family as a "typical boy next door" allowed a girl at the club Zoe Broadhurst in front of him to be served.
Mr Jacob Dyer prosecuting said: “This was an unprovoked attack by the defendant on Jay Jay. Before he attacked there was no trouble."
The court heard Mr Taylor left the club after the attack but collapsed leaving trail of blood along the street.
He was taken to Royal Preston Hospital where he died in intensive care.
Costello, from Rishton, handed himself in to a police station on January 29 accompanied by his solicitor.
He denied murder but later admitted manslaughter claiming the glass was thrown at Mr Taylor.
Smith admitted assault and will be sentenced on Thursday.
After the case Mr Taylor's family said in a statement: "Jay Jay was the ‘boy next door’ kind of lad and since that night he was cruelly taken from us, our lives have never been the same and even after all the on-going pain, on top of this, we had to relive every moment through the unnecessary trial. The two men who attacked Jay Jay still have lives – Jay Jay doesn’t.
"There will always be a huge hole in our family and all because of two men who think they can behave the way they did that night and get away with it."
Det Chief Insp Richard McCutcheon, of Lancashire Police said: “Jack Costello’s actions were savage and brutal.
"Following Kayle Smith’s earlier attack, Costello sought out Jay Jay and launched an unprovoked and vicious assault on him before using the champagne flute as a weapon to deliver the fatal blow.
"This was a cowardly, unprovoked attack which cost the life of a young man.''
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