Uhm, sorry but no. Pizza has never been looked down in Italy. Because most Italians have most often been poor and miserable wretches that couldn’t afford to look down onto any kind of food in the first place.

Perhaps just during post-WW2 we had some form of cultural colonization and shame of the past that - peaking in the ‘80s - made us love and ape anything Made in USA.

Food, music, movies... just look here https://youtu.be/fJ8o26ovKjM

But no, even thinking that the “origin culture” is just claiming as own American-made derivations is frankly shameless hubris