punch a marlin in the rose bucket
Referencing something so old and outdated that it actually has no bearing on the debate.
1st person: "Trying to have an intelligent debate with you is useless! Its like attacking a bulwark with a buckler!"
Person 2: " Now you're just trying to punch a marlin in the rose bucket."
Person 2: " Now you're just trying to punch a marlin in the rose bucket."