Based on what I've heard on the Internet, Italians will straight murder you for eating anything other that a meal directly cooked by their grandmother because it's ineffably wrong, and not endowed by the spirit of Italy.
If course, actual Italians I've known are normal people who typically don't care what you eat.
If they did they’d be a classist bigot not worth fighting. pizza is peasant food invented not for taste but to not starve. If you’re going to so low to gatekeep fight someone for that, that is definitely on the wrong side of history.