A few thoughts....
1. I cannot comprehend this anecdote. To paraphrase Abdul Alhazred, to be tired of shawarma is to be tired of life.
2. I usually avoid McDonalds like the plague overseas. But when I do go there, one of the reasons I avoid "American" items on McDonalds menus overseas is not just because I like to try different things; it's because I learned at a young age that there is an "uncanny valley" when it comes to food. McDonalds sources their items locally, and will change it for local preferences. When I was a wee little Snarfling, accompanying Mama Snarf on one of her periodic "drinking around the world" jaunts, we found ourselves in Ireland ... or, as I was told, land of Whiskey, Guinness and Whiskey. Anyway, I was at a McDonalds and got a burger and fries. And the ketchup was just ... not quite right. I hated it. Food that is similar, but not the same, as what you are expecting is infinitely worse than trying something new.