It was here he called the critic out in front of a packed audience, reciting a lengthy poem
with lines such as: "Thanks for the advice and I'm sure it will do for negative d*******s just like you.
"As for now I've a different weapon, stage and screen is about to beckon and here I sit in first class.
He finished with: "Simon Sweetman kiss my f*****g ass".
The ranting poem Hello Sir was originally penned for a former teacher, and appeared on his first solo album.
Audience members could be heard to applaud loudly, one saying, "I love it, I love it" in the background.
The video was posted by a fan on YouTube following the show.
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Sweetman's review labelled Williams a "ham-fisted hack" and said the gig "showed just how far you can take karaoke if you've got the cheekbones".
He attended the first performance at Wellington's Basin Reserve on Saturday night, which included hits from throughout his career like She's The One and Rock DJ.
The British singer's "baby eater" twitter post was picked up by media around the world, including the Huffington Post.
Sweetman has made no official response to the singer but shared links to stories and the controversial YouTube video clip on social media.
Feedback from Williams' Auckland gig was far more complimentary with reviewer Estelle Clifford calling him "the king".
"You could feel the electricity in the air of an epic final show after 10 months on the road as he shared stories of his kids back at home who he was hanging out to see," she said.
"Dude knows how to rock, and he did."
Others online agreed, sharing their thoughts on Twitter.
- nzherald.co.nz