The comedian seems to have been working on his anti-protest comebacks. Jerry Seinfeld zinged more pro-Palestinian hecklers at a show in Melbourne, Australia, on Saturday. At Rod Laver Arena, protesters began chanting, “From the river to the sea, Palestine will be free,” news.com.au reported. The “Seinfeld” alum mocked the disruptive paying customers. “I think you need to go back and …