I’m vegetarian and my wife isn’t, and it causes absolutely no problems for us.
I cook more often than she does, and when i cook for both of us, i cook vegetarian food. She likes just about everything i make. When she cooks for both of us. she also cooks vegetarian. She’s actually quite happy with vegetarian food, and doesn’t feel the need to eat meat all the time. She even eats vegetarian a lot of the time when we eat out, even when we’re in restaurants with plenty of meat options.
I certainly have no problem with her eating meat, or cooking it in the house. I actually quite like the smell of her roast chicken. Usually, if she feels like meat, we will prepare some vegetables etc. that we eat in common, and will each take care of our own protein. For example, in summer i will often make a soba noodle salad with a whole bunch of red pepper, grated carrot, green onions, bean sprouts, etc. I’ll plonk some tofu or some other meat substitute on top of mine, while she will have some seared tuna. In winter, we might make mashed potato and greens, and i’ll have tofurkey while she has chicken.
The main reason that i don’t cook meat for her is that she generally eats mainly fish or chicken at home, and she has her preferred methods for preparing it. I do sometimes cook meat on special occasions. Last year on her birthday, we had friends over and i cooked a nice dinner for everyone. I bought a prime beef tenderloin, gave it a mustard glaze, seared it in the pan and then cooked it to medium-rare in the oven. It was, by all accounts, really nice. I made marinated tofu for myself.
While some of my reasons for turning vegetarian (over 15 years ago) had to do with the ethics of animal rights and the treatment of animals in the modern food production process, as well as the global politics of food distribution, it’s one of those things that i’ve always felt was really just MY thing. It’s never really been a topic where i felt compelled to try and convince other people to act the same way. If someone asks me why i’m vegetarian, i’m happy to explain it to them, but i never offer to explain unless someone asks, and i’d never dream of berating someone for eating meat. I think the world would definitely be a better place if everyone ate less meat, and it might even be a better place if everyone ate no meat, but there are other issues that i find more compelling and important.