The rock legend said his wife Penny had been upset at how the host and judge acted towards her when she was on the celebrity version of the hit BBC show in 2021.
He spoke as an investigation was launched into complaints about Wallace over a 17-year period.
And a letter signed by 13 people this week claimed they had witnessed his behaviour, including former BBC Newsnight host Kirsty Wark.
Wallace reportedly made sex-related jokes, thrust his body towards a woman and wandered around the studio "completely naked except for [a] sock pulled over his penis".
Sir Rod, 79, blasted the 60-year-old.
He wrote: "You humiliated my wife when she was on the show, but you had that bit cut out, didn't you?
UNCOMFORTABLE
"You're a tubby, bald-headed, ill-mannered bully. Karma got ya."
Kirsty, who was on Celebrity MasterChef in 2011, claimed Wallace told jokes of a "sexualised nature" in front of contestants and crew she felt were "really, really in the wrong place".
She told how her experience on Celebrity MasterChef was "joyous", but added: "The fly in the ointment, on occasion, was Gregg Wallace.
"I think people were uncomfortable.
هذه القصة مأخوذة من طبعة November 29, 2024 من Daily Mirror UK.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك ? تسجيل الدخول
هذه القصة مأخوذة من طبعة November 29, 2024 من Daily Mirror UK.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك? تسجيل الدخول
ARTETA IS GAB FAB FOR GOALS
Transfer window open but Gunners boss is happy with his firepower...
Lack of pace is a running theme at a club suffering from woeful recruitment
LIVERPOOL Manchester United is one of football's great redletter fixtures but I can't recall a bigger divide between the teams.
SLUMP IS MY FAULT
Pep: Blame me for the drop in results... I should have found a way to lift my struggling players
Lou Macari... an angel in Stoke and part of the last United side to be relegated
STOKE & UNITED LEGEND LOU MACARI
Jones says Tara to her former career
STAR SWAPS BALL FOR A WHISTLE!
EVEN THE CROWN PRINCE OF BAHRAIN IS A HUGE FAN
AFTER reaching the PDC World Championship final on his debut 12 months ago, Littler's magic touch spread immediately to the Persian Gulf and charmed the Crown Prince and Prime Minister of Bahrain.
'Zombie knife' horror on Coronation Street
Mason plot highlights UK stabbing epidemic
1 in 4 Grenfell fire heroes hit by long-term sickness
THE impact of toxic smoke on the Grenfell Tower fire crews could be monitored after a report found a quarter suffered long-term health problems, a minister suggested.
New Orleans warned over vehicle attack five years ago
Security firm had concerns about defences and faulty traffic bollards
MY XMAS MIRACLE
Strangers pitch in after Isabella's purse is stolen