There are whole styles built around using cheddar as well (it isn't only because it is cheaper). And if it is like a small part of the blend, I don't mind (Papa Ginos I think might use cheddar in its three cheese for example). But a lot of the places I delivered for were all or half cheddar. And they piled it on very thick. It just didn't taste right to me. I will say I was being somewhat facetious in response to outrage over pineapple as a topping. I'm actually all for pizza experimentation. But if we are going to point fingers, maybe direct it at the cheddar rather than the pineapple
Some of the stranger toppings I saw were things like Cod and Scallops. I like anchovy pizza sometimes. But cod, unless it is super fresh (which it usually wasn't at a pizza place) made the pizza smell like ammonia. And scallops, as much as I like them on their own, just don't feel right with cheese to me.