Should a vegetarian and spouse pay for meals that include meat for the family?

A vegetarian in the family who doesn't eat meat because of animal cruelty has a spouse who eats meatless meals at home but eats meat outside the home. Very little meat--from restaurants--comes into the house. When their family visits, the vegetarian occasionally prepares a vegetarian meal for everyone, but sometimes everyone goes out to eat. (No meals with meat are prepared by the vegetarian or spouse.) People usually take turns paying the bill in restaurants so, in effect, the vegetarian is contributing to meat for a few people. Do you consider this normal, or do you think that there should be separate checks or perhaps that the vegetarian host shouldn't even give the option of going out to eat? The vegetarian's spouse is the primary breadwinner between the two of them. Please tell me if you are a vegetarian or not when you answer the question.