There's this little test where you can determine a lot about a person, and generally get a judgement of their character. That is the shopping cart test. Barring any potential disability, or emergency preventing you from doing so, once you finish your grocery shopping, and load the groceries into your vehicle, do you then go and return the shopping cart to the corral? Or do you leave it next to the parking space?
I think there is a similar test, but on a smaller scale. Rather than judging someone's character, you're instead judging their general temperament. That test is asking the pineapple on pizza question. This one is a trick however. Yay or nay.. Regardless how you feel about the food itself.. What's more telling is the way in which you answer. If you start to evangelize in either direction, whether you are writing your congress person suggesting they present a bill banning pineapple on pizza, or you're petitioning the CEOs of the famous pizza chains suggesting that pineapple should replace pepperoni as the default pizza topping... Either way.. I'm not saying you're a bad person... but you are getting un-invited from the pizza party.