Adult kid encounters antisemitism in professional school holiday program

I'm so frustrated. There is nothing that I can do about it, and I don't think kid will do anything about it, either. My adult child is in post-college professional school, in a prestigious field that will involve vulnerable clients. Kid is in a volunteer musical group at this school, which is doing a holiday program that will include a token Jewish song, Oseh Shalom, which is a prayer for peace that has been part of the liturgy for probably over a thousand years. At the end of the rehearsal, one of the players voiced his opposition to doing the song, because of "context" issues, in light of the war, solely because the song was in Hebrew.

My kid was so disgusted, that they just walked out. Kid is generally nonconfrontational, tends to think the best of everyone, had drunk the Kool-Aid until now that there is a difference between anti-zionism and anti-semitism, but this was so blatant, that even my kid could not stomach it. I asked if they will do something about it, and they said they will not, unless the song is cut.

I am sickened by this. Both my kid and this older student had attended the same prestigious undergrad institution, but about 5 years apart. My kid has seen plenty of anti-zionist activism. I feel that something has to be done about this person, who is so blatantly antisemitic that he thinks that doing a holiday song in Hebrew, which is a liturgical prayer for peace, should be banned. I would not trust this person to care for Jews, but there is no way that he will not be in that position in the near future. Yet I cannot intervene, and I cannot push my kid to do so. I mean, this is not elementary school. At the same time, I'm really worried for this man's future Jewish clients, let alone any Israeli ones. They will not be in a position to protect themselves from him.