AITA for telling my friend why a restaurant stopped accepting our group reservations?

Six friends meet for brunch every month. Our usual restaurant recently told me it could no longer accept reservations under our group name.

The manager privately explained that my friend Colin had repeatedly sent food back after eating most of it, argued about automatic gratuity and called a server “sweetheart” after she asked him to stop.

When I told the group we needed a new venue, Colin blamed the restaurant for poor service. I said, in front of everyone, “They stopped taking us because of how you treat the staff.”

Colin demanded details, so I repeated what the manager had said. Two friends immediately told him they would not dine with him again.

He says I staged a public trial using claims he had no chance to answer. He remembers one returned meal and says “sweetheart” was not meant romantically. He also says the manager violated his privacy by discussing him with me.

I had promised the manager I would handle the issue without naming the employee who complained. I could have spoken to Colin alone first. I did not because the rest of us had spent months apologizing, tipping extra and pretending each scene was isolated.

The restaurant has offered the five of us a new reservation. Accepting it feels like relief and like a vote taken while Colin was still defending himself.