What is there to explain? If you don’t add any savory ingredients to pasta it is not salty or savory in taste.
Same as you can prepare rice savory or sweet as rice pudding or something.
You do know “pasta” just means the noodle, right? It’s still pasta if you don’t add anything?
There are lots of sweet pasta dishes in the world like sweet kugel or milk noodles.
I just add (cold) applesauce onto (warm) noodles and eat it. If I’m fancy, I make applesauce from fresh apples.
Also, look up portugese Aletria. That’s angle hair pasta as it’s best.
Dude. Your problem is not the pineapple, but that you are apparently surrounded by inconsiderate people.
If you get pizza or any food to share, you should make sure you choose a topping everyone is okay with. If necessary make it half pineapple half pepperoni or whatever.
If you order for a group of people and choose something that is controversial without checking back, you’re an asshole.