I am of the opinion that plants are people too, except they can't evade predators. It's more curel to eat lettuce than it is to put a lobster in boiling water. The lobster has more of a chance than the lettuce.

I'd agree not to serve lobster at a dinner party she was invited to if she promised to return the favour by hosting a barbecue with just meat, bread, cheese and non-vegetable based sauces.

Then I'd tell her she makes a shit cup of tea and refuse to drink it, instead going to the kettle and making myself one.