Considering tomatoes aren't even from Europe the Italians can think whatever they want about pizza, they're not experts, they're just as wrong as everyone else.
There's a lot of things to argue about, but pizza just isn't one of them. It's a chunk of bread with leftovers on it. If it tastes good on pizza, it belongs on pizza; and what tastes good on pizza depends on the tongue probing it.
Pineapple... sausage... anchovies... goat cheese... potato chips... a fucking strawberry slurpee - if you like it, you rock it.
The only wrong option is to abstain from making/ordering the pizza you want because that ingredient doesn't 'belong' there.
I despise this traditional "that doesn't go on that dish" bullshit.
It was that way with the food where I'm from and well and now the new generation is doing whatever they want with those traditional recipes and making them modern and it's amazing.
If you don't like pineapple on your pizza don't have it. But shut the fuck up with your "that's not a pizza". You sound like my great grandma
Edit: I'm from El Salvador and people used to freak out if you suggested that pupusas should have more variety than just pork, cheese and beans. They'd yell at you that it wasn't traditional. Now the young generation is making pupusas with chicken, fish, shrimp, sweet potato, zucchini, and so on, and it's amazing!
I don't think its the same than combining a sweet fruit with tomato sauce and cheese.
Pasta by itself is basically neutral in taste. You can easily make them into a sweet dish. I sometimes like to eat them with applesauce.
Just to clarify, I wouldn't order or make pizza with pineapple for myself, but I don't think it's that big of a deal people sometimes make it.
Just eat what you like and don't force your taste on others.
Are you being forced to eat it? If not I’d say stop giving a fuck so hard about what other people like or how they live their lives by things that shouldn’t affect you. You can’t control them. Live and let live. That’s the feel.
And if you’re still not satisfied and have the burning desire to feel outraged, Find something for real to be outrageous about. Like current wars or stupid candidates or fixing up dumb city laws that hurt innocent citizens. Go to a rally to defend some human rights or something like that. Get juicy with your rage.