Friends husband keeps saying he is going to eat our guinea pigs!

That's pretty stupid, I don't know why he would think that's charming to say once, let alone over and over. I get annoyed by people who call chihuahuas rats, I'm not really offended if you think my dog looks like a rat and you don't want one, that's fine. They didn't have that original observation, it's an old, cliche joke, no one is laughing. Let it go.

Some people want so badly to be funny but they're actually just annoying.