Jeremy Jacobowitz, a food creator with more than 485,000 Instagram followers, held back from posting about the Israel-Hamas conflict, at least at first. But in the last month, Jacobowitz, who is Jewish, has been flooded with aggressive messages from people wanting him to speak out about the war. “Especially because I’m outspoken, but I choose my battles wisely, I don’t say things just to say things,” he said in an interview. “It took me maybe three or four days to post something, and by that point I was flooded with DMs accusing me, not in a nice way, of not...