If he claims religious dietary rules then Jerry is a bigger liar than he has shown, and that is a lot. Working with Nadler’s twin for 20 years I know both are/were atheists. Though Richie was reconsidering the two or so years before he passed. They were/are cultural Jews who attended synagogue in the same way A&P Catholics attend Mass. So chalk this incident up to gross self importance and not kosher dietary laws.
Nadler had a twin?
Did he eat him?