“And he said something about being tolerant of other people's life choices - as if being straight was some kind of life choice.
“It just made me really angry... It is, in my view, homophobic.”
Speaking to the JC, Mr Percy said: “So consumed by hate are people like Annie Cohen and her ilk that, even when I referenced progressive Judaism’s inclusivity towards couples of all shapes and sizes - be that same-sex or inter-faith relationships - as the reasons I was drawn to progressive Judaism, she still, because of this hatred in her heart, attempts to smear me and create a division when no division exists.
“It is just disgusting. She is consumed by hatred and bigotry.”
He called on Labour to suspend Ms Cohen, if she is a party member, and launch an investigation.
Mr Percy, the MP for Brigg and Goole, announced he was converting to Judaism in March 2017.