I have chosen not to date this person because she is an omnivore.
Is there a reason you don't want to date an omnivore?
I feel like I'll need to deal with her dietary needs and the way she eats.
You shouldn't make the decision of who to date based on people's diets. Don't judge her based on what she eats.
I suppose. I'm going to rationalize it in my mind and ignore her dietary needs.
I applaud you for choosing to not judge her based on her diet. There is far more to a person than their dietary choices and you two might end up really liking each other.