I just push in references that he won't understand, like talking about a Super Speedy Cider Squeezey 6000, and that Pegasus' control the weather. He just thinks I'm mad. And then I start shouting at him, Chimmicherry, cherrychunga! I do this to everyone, for fun. And I'm on a quest to find 5 local Bronies not including myself... I've found two already, and there are about 8 more on a facebook group.
I'm deleting everything on my MP3 right now to replace with MLP related stuff just to annoy one in particular who hates me listening to the songs.