Can you explain to me how animal fat would get into her food if both items are properly sealed - as everything in a refrigerator should be anyway?

Do you know what the word contaminate means?

Because when you are handling meat, even packaging it, the bacteria is all over your hands. Therefore it goes on the outside of your package meat. Even at the grocery store, the butcher or handler has been touching meat all day. Then it goes into the fridge, sits on the shelf, and then the vegetarian puts her food on the same shelf.

You're right, Fishfanatic. In fact, many vegetables and fruits that grow in warm climates aren't adapted to the cold and will get mushy in the fridge: bananas, cucumbers, zucchini's, bell peppers, melons, etc. And the fridge isn't the best place for tomatoes and root vegetables either. Now your username gives me an idea for a compromise. Merrymarry could say: "OK, I won't put meat in the fridge but only fish." Fresh fish, in open containers.

Being a vegetarian isn't unnatural. Though OP's roommate was being dumb for getting angry about that. I'd understand if OP was shoving unwrapped, dripping meat on the top shelf, but as long as it's packaged it's fine. OP's roommate and OP should've considered this before choosing to live together anyway.

Gah damn veggie burgers aren't even vegan friendly, almost all have eggs or milk, same with bread. She probably doesn't eat them.

She's a vegetarian dimbass not a vegan there's a diffrents.. Google it!..

I don't eat milk or eggs but I still eat honey and yeast, so I'm not a vegan. Someone that damn militant probably doesn't eat eggs.

They taste and smell nothing alike. I've found some vegan veggie burgers. They're yummy.