A lout violently grappled with a police officer - after mocking his Edinburgh accent.
John Reid had ridiculed PC Frank Erasmus insisting people from the Scots capital were "p***s and f*****s".
The 18 year-old fled from officers during the incident in Glasgow's Kelvingrove Park last June.
But, when PC Erasmus caught up with him, the officer ended up with an injured arm after Reid struggled with him.
The teenager's lawyer blamed Reid's downing of two bottles of Mad Dog 20/20 fortified wine for what happened.
The first offender today admitted resisting police as well as behaving in a threatening and abusive manner.
A sheriff showed him mercy as he was ordered to be of good behaviour for 12 months.
Reid, of the city's Partick, had got involved in an incident with other youths at the park.
He ended up then approaching PC Erasmus.
Prosecutor Jenny Reid told Glasgow Sheriff Court: “Reid asked ‘Are you from Edinburgh?’ and began to mock the Edinburgh accent.
“He stated ‘Everyone from Edinburgh are f***ing poofs and f***ing f*****s’.”
Other officers confronted Reid - who then shouted: “F**k you ya goofy b*****s.”
The teenager raced off before PC Erasmus caught him near a police van.
Miss Reid said: “During the struggle the officer was forced into the near side passenger window.
“It caused the window to smash.
“The officer received an injury to his left elbow that was bleeding.”
Reid continued to struggle as he was finally hauled to the ground.
Neil Stewart, defending, said Reid was now apologetic Mr Stewart added: “Mr Reid had consumed a significant amount of Mad Dog which has a high alcohol content.
“He had two bottles of that throughout the day. However, this is no excuse.
Sheriff Valerie Mays told Reid he must return to the dock in a year's time when she will check if he has behaved.
She added: “As you appreciate this is a relatively serious incident.
“It’s difficult to understand what you were playing at."
