The singer was speaking with 2Day FM's Kyle and Jackie O about her new single when Abbott -- who is campaigning on a platform for "traditional" marriage -- phoned in to ask the California native when she's going to perform in Australia again.
But Perry didn't want to talk about performing. She wanted to talk about politics -- specifically, the politics of equal rights.
"Let's talk about gay marriage," she said. "Yeah, buddy, that's right. Love is equal."
A host then explains that Abbott is against gay marriage.
"I love you as a human being, but I can't give you my vote then," Perry added. "I just don't believe in your policies so that's what a lot of people should be doing.