I'm afraid that no matter what you say, Isaac Bashevis Singer has already said the following:
“In their behavior toward creatures, all men are Nazis. Human beings see oppression vividly when they're the victims. Otherwise they victimize blindly and without a thought.”
“As often as Herman had witnessed the slaughter of animals and fish, he always had the same thought: in their behaviour towards creatures, all men were Nazis. The smugness with which man could do with other species as he pleased exemplified the most extreme racist theories, the principle that might is right.”
“As long as people will shed the blood of innocent creatures there can be no peace, no liberty, no harmony between people. Slaughter and justice cannot dwell together.”
He has said that the cruelty he experienced at the hands of the Nazis is the same cruelty meat-eaters inflict upon animals. Do you not think he has that right, to interpret his own experiences? Would you descend from heaven to tell him the meaning of the violence he suffered, because you know it better than he? He doesn't think it's gross, he thinks it's true, and I trust him better than you, unless you tell me right now you were in a German concentration camp in 1945.