The answer to this question can vary depending on personal taste preferences, but one ingredient that often receives a lot of criticism on pizza is pineapple. Adding pineapple to a pizza can be quite divisive, and many people feel that it doesn't belong on a traditional pizza, especially when combined with tomato sauce, cheese, and other classic toppings. The combination of the sweetness of the pineapple with the savory flavors of the pizza can be off-putting to some individuals. However, it's essential to remember that pizza preferences are highly subjective, and what one person may dislike, another might enjoy. Ultimately, the best pizza toppings are a matter of personal taste.