On last night's (November 7) episode of the BBC magazine show, Jones was talking to previous Strictly contestant Peter Andre alongside current stars Graeme Swann and Oti Mabuse.
After they watched a clip of Peter on the show in 2015, Alex admitted she was "surprised" that he didn't make it to the final that year.
"Well the guy that won was excellent, he really was," the singer said, referring to the eventual champion Jay.
"Nobody knows about him anymore though, we're talking about you now," Alex replied, to some awkward chatter in the studio, Oti declaring: "Shade!"
Her comment did not go down well with viewers on Twitter, one disgruntled fan writing: "Alex Jones obviously didn't do her homework before talking to Peter Andre or she would have known many people do remember."
What !!! I didnt watch The one Show tonight but there were over 11 million people watched the 2015 final when Jay won, Alex Jones obviously didn't do her homework before talking to Peter Andre or she would have known many people do remember. https://t.co/e5Oq6O7uvg- Nan (@annbrett40) November 7, 2018
Another added: "Well, nearly most people that I talk to about Jay being a fan of my art remembers Jay winning #Strictly and his Jive So a lot of people do remember Jay".
No one remembers @JayMcGuiness winning #Strictly (Said Alex Jones on The One Show talking to Peter Andre tonight) 😯😠- Bethan Turner (@Bethan_Artist) November 7, 2018
Well, nearly most people that I talk to about Jay being a fan of my art remembers Jay winning #Strictly and his Jive 😉😉
So a lot of people do remember Jay 👍🏻👍🏻 pic.twitter.com/st9mGKxrO9
Many more took issue with the comment:
I was taken aback when @MissAlexjones said that. Not sure she actually knew which year Peter Andre took part & therefore who won in his year. If she had realised it was Jay who has actually worked for @BBCTheOneShow she would most definitely not have said anything that silly!- PollyT (@polllyt22) November 7, 2018
Perhaps @MissAlexjones and @BBCTheOneShow would like to revisit the views of Jay's jive, salsa, rumba etc on YT. (And don't get me started on geoblocking😡)😊- hannah (@ForrestjJan) November 7, 2018
Yes we all remember the winner in 2015. (Series 9 not so much.)
Who could forget that jive he did earlier in the series. Deserved winner- Sazzle (@sazinthedon) November 7, 2018
I am lost for words. WHAT PLANET is she on (A/J), and saying it to P/A of all people.Hope I haven't over stepped the mark. I am so angry.- Monica Routledge (@moroutledge1) November 8, 2018
That has finished me for the day.
People will remember that day long after P/A is a distant memory
Digital Spy has reached out to Alex's representatives for comment.
Strictly Come Dancing continues this Saturday on BBC One, while The One Show also airs on BBC One.
('You Might Also Like',)