I have a possible theory on why some people have such a strong hate toward pineapple on pizza or, another widely hated food product, fruitcake.
People naturally expect fruit to have a certain flavor/texture/temperature/consistency, and if what hits their tongue doesn't fit that expectation, then yeah the shock factor translates to strong disgust. (This is probably common knowledge but oh well)
(Someone posted about pineapple pizza on another site just now so that's why I came back to this.)
Like I'll eat it sure. There are tons of different pizzas out there that have wildly different flavors and I love them all! But when I go for pizza I'm usually for the savory flavors since it's the main meal so the sweet is not what I'm looking for at the time. So most of the time I pass over pineapple and go for the pepperoni and beefs XD
I feel as if though people make More of a deal about it now ever since the issue started to rise XD to be honest I like it, but I prefer pepperoni. There's people out there who eat deep fried chocolate or maggot infested cheese, id rather choose pineapple pizza any day XD