"I like dogs better because they're more friendly."
When people make such comments, they don't seem to realize they're suggesting you don't like friendly animals.
"I can tell you have cats."
As a cat owner, you may indeed have a cat hair on your sweater, just as you sometimes have toys in the living room when there are kids in the house.
"You might be turning into one of those crazy cat ladies!"
People may think they're being funny, but it does seem to be a veiled insult.
"If I had cats, I wouldn't let them get on my counters."
If you ever hear this, it's tantamount to telling someone how to raise their kids or keep their house clean.
"I could never have a cat because I'm allergic."
Perhaps the best thing to do is express sympathy; pet allergies can be a pain, but what else can you say?
"Cats are always so lazy."
Every cat owner knows domestic felines have a secret life that outsiders know nothing about.
"Where will the cat go when the baby comes?"
It's a little-known fact that in households that include pets, babies have fewer allergies.