The girlfriend of a man who lives with Mittens wants him to get rid of his cat because his cat is an obligate carnivore and she is a vegan. She says it’s a choice between his cat or her.
She believes that all domestic cats should be extinct which must mean that she wants to destroy them all which in turn is completely counter to her veganism because vegans have a concern the animal welfare.
I think that she is not thinking straight or has a hidden agenda.
Some people think that she wants to break up the relationship and is looking for an excuse.
This sort of behaviour happens especially in women in my experience. I am not being sexist but make that observation based on hard first hand experience.