Perhaps you could forgive that audience member's misplaced enthusiasm: A whole lot's changed for Musgraves since she last toured Australia in 2015. It's all thanks to her incredible fourth album, 2018's Golden Hour, which she's performing in full — all 13 songs — on this Oh What A World tour.
That rapturously received record catapulted her from country darling to mainstream star, and from the first lines of concert opener Slow Burn, she's met with the sort of hysterical screams usually reserved for Korean boy bands. Her fans — decked out with a mix of cowboy hats, glitter and rainbow flags — bellow every word, of every song, back at her.
On stage, the 30-year-old star looks like the impossibly glam love child of 1970s Cher and Dolly Parton, resplendent in a floral polyester flared pants suit (that she will later admit does not breathe at all under the stage lights). Her six-strong backing band, decked out in matching lounge suits, complete the Grand Ole Opry fantasy.
She treats fans to a smattering of older material — early single (and queer anthem) Follow Your Arrow gets a particularly huge cheer — but Golden Hour's the real focus here. Instant classic singles like Space Cowboy and Butterflies are delivered faithfully, but there's room for a few surprises too: The philosophical Oh What A World is somehow even better stripped of its Daft Punk-lite production, becoming one of the night's most intimate moments.
Musgraves finishes with the disco-pop kiss-off High Horse, doing her best to dodge a bunch of wigs hurled onto stage as an apparent sign of appreciation (wigs? shoeys? — come on Sydney).
Earlier, she admitted she still felt "low energy" after a 20-hour flight and revealed she was battling a genuine phobia of Australian wildlife, particularly cassowaries and huntsman spiders.
Kasey Musgraves is due to perform at Auckland's Town Hall on Friday, May 17.
Let's hope there are are no spiders or shoeys involved - although if Post Malone's recent show is anything to go by, we might not be any better than our whanau across the ditch!