Am I wrong for getting mad when my boyfriend calls my dog's puppies 'rat', or 'possums'?

This isn't just a one-time thing, he does this every time. Whenever I ask him about them he'll usually say something along the lines of, 'The rats...' or 'The possum'. When I finally got enough of it, he said I was 'getting worked up over nothing.' and that 'It's just how he calls them, it doesn't mean anything bad, was I wrong for getting angry?

Am I wrong for getting mad when my boyfriend calls my dog's puppies 'rat', or 'possums'?
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