Carnival Cruise Lines review: Unfairly denied boarding

I am writing to report an extremely distressing experience involving unfair treatment, denial of boarding, and poor customer service during embarkation for the Carnival Firenze departing from Long Beach.
From the moment we arrived at the cruise terminal, we were subjected to treatment that felt discriminatory and unjustified. After clearing security, my party and I were singled out and asked to step aside for an additional search. We were required to remove all items from our bags, while staff scanned our documents and made multiple copies. When I asked whether something had been flagged during the bag scan — since we were the only passengers pulled aside — I was told this was “procedure.” Notably, we were also the ONLY BLACK passengers in that line.
I informed staff that this was my fourth Carnival cruise, and I had never experienced such treatment. I was told that “different terminals have different rules,” which did not adequately explain or justify why we were singled out and treated like criminals.
Once we proceeded to check-in, we notified staff that the required 25-or-older accompanying adult for a minor in our party was on the way, though we were temporarily unable to reach them. The guest service agent, Aiden, was professional and helpful. Unfortunately, his supervisor was dismissive, rude, and snarky throughout the interaction.
When the accompanying adult arrived, he presented his boarding pass at the desk and clearly stated that he would be responsible for accompanying the minor, as the room would be occupied by the 20-year-old and a 21-year-old. Staff took his boarding pass away for 10 minutes, then returned and stated — without a clear or adequate explanation — that the minor was denied boarding despite being properly accompanied.
We were told staff would escort us to a place to sit while this was addressed; instead, we were escorted outside the terminal WITH NO SEATS. During this time, staff held our passports for ALMOST A HOUR. Multiple employees were unable to explain why the documents were being held or provide any status updates.
Additionally, my checked luggage was lost. While our carry-on bags were eventually returned, staff stated they were unable to locate my checked bag and could not explain why it was separated from my other luggage or how the luggage handling process was so disorganized.
This is now the third time I have submitted a complaint regarding this incident, and I have yet to receive any response from Carnival. The lack of accountability and communication has only compounded the frustration and distress caused by this experience.