Michael Joseph Pertzel's assault left his 47-year-old father with a fractured left ankle and a laceration to his upper lip that required stitches.

But his victim later had no memory of the attack, nor on how he got home after downing at least five glasses of wine at a friend's house on July 22.

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The 27-year-old had begun living at his father's home in February, but the pair, Albury Local Court has heard, were now estranged.

Pertzel, who represented himself, told magistrate Richard Funston that he accepted he simply had to keep away from his father, who he claimed had inflicted domestic abuse on both he and his mother over many years due to his addictions.

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He said he had told his father to stop using illicit drugs and had become frustrated with finding needles used for injecting drugs around the home.

Pertzel said he had obtained work in Queensland and so hoped to move once allowed under COVID-19 restrictions.

Mr Funston asked Pertzel why he had assaulted his father.

"He just started picking and picking," he replied, pointing out his father's long-standing issues with alcohol and illicit drugs.

"I've seen him bash Mum in front of me. No one else in the family has got time for the man."

But Mr Funston said that still was no excuse.

"Whatever else was going on that day you did the wrong thing," he said.

Pertzel, of Comans Avenue, pleaded guilty to two charges of assault occasioning actual bodily harm.

He was fined $1000.

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