In a balanced world, everyone is entitled to an opinion, but those pages are far from balanced or democratic. Sadly these non-affiliated social media pages are just a fan club, often moderated by people that will prevent contrary opinion. In the case of most unofficial P&O pages, it is only OK to negatively critique other cruise lines. To become part of the collective, resistance is futile.
So, a contrary opinion is shouted down. Even facts are dismissed if they don't fit the agenda of the group, and once again, everyone nods in agreement.