Translation of Ansprechpartner

A bystander who watched the entire scene all the time decided to help me. He was an older man, around seventy, but nonetheless he went to the oldest of these kids and slapped him. The boy was sixteen.
I tried to explain that I was preferring to eat with everybody together I that I preferred not to eat meat if they did not eat it either, for financial reasons. I thought that they understood my feelings.
Unfortunately, the boat's maneuvering system broke down and we were told that we could not take it. We were furious, but decided to make the best out of the situation. The offered to take the Red Dragon instead.