I am a 70-year-old Jewish man, but never in my life have I seen or felt the antisemitism of the last few weeks. I have heard antisemitic things from time to time through my life. I remember as a child being called a “dirty Jew,” and my friends and I being called “Christ killers” as we walked to Hebrew school. I recall a college girlfriend’s parents telling her that she should not go out with me because “Jews are different.” I had an incident in a class I was teaching about the ethics of negotiations, where a student matter-of-factly said,...