I tend to approach these conversations like Rob W. mentioned on page one, by pointing out their leather purse, or that sudsing agents in beer are animal by-products (so I'm been told), or leather upholstery in their car, etc. And that, yes, if they don't want to actually do the killing themselves, I don't have a problem with that. But don't chastise me because I'm willing to, as Rob said, cut out the middleman.
Or I try this logic. Should animals have the same rights as humans? (YES, they'll say). Okay, wolves kill deer, right? (YES). Well, if animals have the same rights as us, we should have the same rights as them since we're just animals, and therefore I have the right to kill something to eat it.