The former Oasis frontman played a number of the band’s hits as well as some of his solo numbers when he performed at year’s festival.
However, his sibling and former bandmate was less than impressed with his efforts, claiming he made their songs sound “weedy and thin”.
“I don’t think I’ve ever been so embarrassed for a man in my entire life,” he said in an interview with the Guardian.
“He’s pulled off the incredible magic trick of making those Oasis songs sound weedy and thin.
“And he looked like he was having the worst day of his life, walking around in what looks like a pair of my son’s pyjamas, shouting into a mic about some perceived injustice … if you can’t sing ’em, don’t play ’em!”
And he added: “I reckon if I put my two sons in a room – one’s nine, one’s 11 – they could probably muster up something better than that new single of his.”
Noel’s comments come weeks after he claimed Liam had been sending his daughter “threatening messages”.
He shared a screengrab of what looked to be a message sent from Liam to his niece, Anais, in which he said she should tell her stepmother to “be very careful”.
Liam later hit back at his critics on Twitter after apologising for his “childish behaviour”.
As well as slagging off his brother, Noel covered a range of other topics in his Guardian interview, giving his views on Brexit (“None of us were even qualified to vote”) and gender fluidity (“What’s that? I know what gender I am – Mancunian”).