I caught the reference: Thanks to your cultural imperialism, or to me being such an astonishingly hip and with-it guy, or whatever, I knew about that fake-butter thingy.[*]
I just... didn't think it was funny anyway. Sorry I can't be more specific, but it seems I'm better at dissenting than at dissecting.
[*] The most probable cause, come to think of it, must be that it's been mentioned here on Iwethey before. Don't ask me where and why, but with the way discussions here meander from one thing to the other, it certainly isn't impossible.