My theory on why people don't like pineapple on pizza is that most of them pair it with sweet ham, so they lose the full effect of the spicy/sweet/salty combo. Pineapple on pizza is amazing, hawaiian pizza is an abberant form that should be removed off menus everywhere and replaced with the true god-king: The PPJ.
That's peak Pizza for me! Especially with both pepperoni and sucuk (turkish garlic salami that's basically available in every Pizza delivery place in Germany).