Open this photo in gallery: A pro-Israel demonstrator shouts at Palestinian supporters during a protest at Columbia University in New York, on Oct. 12.Yuki Iwamura/The Associated Press Katie Lynes is a writer based in Toronto. My worst childhood memory is the day I told my Jewish mother, “I hate Jews.” I was around six years old, and I’d heard someone older say the words. Not fully understanding their meaning, I repeated them to my mother. I recall the muscles of my mother’s face going flaccid, instant tears in her eyes, her look of alarm and her broken-voiced attempt to explain...