The speaker of "Having a Coke with You," is a recovering art buff. With casual references to "The Polish Rider," Futurism, Marino Marini, and more, we get the clear sense that this is someone who knows their stuff. We say "recovering," though, because, even though he knows his stuff, he doesn't think too much of it anymore. He's got love in his life now, and its wonders have shown him, in no uncertain terms, the futility of art. The speaker's leaving the world of art behind in favor of the wonderful lands of love.
Even though it's just a representation, real art is every bit as capable of moving someone as a real, live person is. So there.
The speaker is not really done with art, entirely. He's just temporarily distracted by his love, and will some day return to his admiration of art. (He's just on a break, you see.)