It's strange. It's perfectly fine and legit to be pissed about a bad decision from a ref when it happens, and ya know in the aftermath of a game. Part of fandom and being passionate about the sport. I readily admit to it myself.
Bizarre to continue watching a sport that you think is illegimate and fixed. It's not the complaining about ref decisions in the heat of the moment that makes people sound like Napoli and Roma fans, it's when people are still bitching about them a year later, or using them to promote conspiracy theories about how the games are rigged in favour of certain teams. And even if refs favour attacking teams more with how the rules are enforced today, doesn't mean they favour those teams, just that the rules are stacked in favour of certain playing styles, which every single team has the ability to play.
Oh well. I was pissed in the immediate aftermath of Barca and Bayern the last two years, but that quickly fades to understanding that they took their chances and won because of it, and we didn't, regardless of refs. And as shown today, these things balance out over time.