The sweet/salty combination is actually heaven sent and you need to RESPECT. IT.
Let me explain it to you in some simple mathematical terms...
Pineapple is delicious.
Pizza is delicious.
PINEAPPLE + PIZZA = DELICIOUS.
Listen, we live in a world where KALE and OLIVES and goddamn ANCHOVIES are allowed to live on as "acceptable" pizza toppings. Why not pineapple?
In conclusion, you are allowed to keep your incorrect opinion but pineapple on pizza is a fucking delight.