I’m A Celebrity...Get Me Out Of Here! viewers were furious at the campmates during Wednesday's show after their embarrassing blunder.
As part of a trial to win some snacks for camp, they had to correctly answer which colours are on the Welsh flag.
As the series takes place in Wales this year, plus Paralympian Hollie Arnold has represented Wales in the Commonwealth games, fans did not expect this to be too much of a challenge.
But none of the campmates had any idea what the flag looked like, with Jordan North racking his brains to recall Gavin & Stacey's Nessa's tattoo of the flag.
They were given the options of A) red white and green, and B) red white green and yellow.
"Where is the yellow on the Welsh flag?" asked Vernon.
"Is it the dragon's eye, or the end of the tail?" wondered Victoria Derbyshire.
Shane Richie announced: "We all think it's A!"
Victoria interrupted, scolding him: "No no no no no no, we don't yet!"
"I am just thinking of Nessa's tattoo and I don't think there is any yellow in that," Jordan North contributed.
One baffled viewer tweeted: "Hollie Arnold MBE WELSH commonwealth athlete and Paralympian but idno if there is yellow in my national flag, sorry what?"
Another remarked: "no but seriously where in tf did they think the YELLOW on the welsh flag could be".
Another joked: "watching english people debate the colours of the welsh flag has radicalised me #ImACeleb ".
A fourth ranted: "The f**k do people not know the colours of a flag in their own country, f**k sake. I actually despair".
"How did it take more than two seconds for them to know what colours are on the Welsh Flag?" wondered a fifth.
A sixth ranted: "actually appalling that they weren't sure what the welsh flag looks like".
* I'm A Celebrity...Get Me Out Of Here! returns tomorrow night at 9pm on ITV.
