A graphic designer was jailed for a minimum of 14 years on Friday for killing a telephone executive with a broken bottle after a Jessie J gig.
Ashley Charles, 26, was found guilty of murdering Phillip Sherriff, 37, and jailed for life at the Old Bailey.
Sherriff died in April four days after being attacked at Pulse nightclub in central London, shortly after the singer had performed.
Charles, of Nevanthon Road, Leicester, denied the charge, claiming he acted in self-defence.
But Judge Paul Worsley said Charles killed Sherriff, of Preston, Lancs, because he was annoyed.
Judge Worsley told Charles: "This is a tragic case. Sherriff may have pushed you in a crowded bar and made inoffensive remarks to a girl talking to you.
"You clearly became annoyed at what you perceived was the conduct of Sherriff and lost your temper when he may have pushed against you at the bar."
Charles took a beer bottle from Sherriff's hand and swung it behind him, where it broke, and then plunged it into Mr Sherriff's neck.