Davina wrote: 'I'M SORRY? But since f***ing when is it ok for men to talk about women like this in this day and age?'
Adding: 'What a disgusting little boy! Now Australia can see the Ryan we saw! Grow up @ryangallaghergram, There is no need for you to publicly speak about your conquests. Shame on you!'
During his comedy performance in Sydney, it is believed that Ryan made claims he slept with fellow MAFS star Ashley Irvin after the show finished filming.
Also during a Q&A segment with journalist Rosie Waterland, Ryan implied he had been intimate with Ashley.
Rosie asked, 'Who did you sleep with?', which prompted Ryan to say: 'It rhymes with Mash!'
Ashley hasn't yet responded to Ryan's claims.