Right! Christians have very diverse views about same-sex relationships. Oddly, most Lutherans utterly disagree with the people who run that school. The Evangelical Lutheran Church in America (ELCA) is far and away the largest Lutheran denomination in the U.S. They are also one of the most LGBTQ-affirming, with gay and trans pastors, same-sex weddings in church, etc. Being a Lutheran certainly does not equal mistreating queer young people. That's a choice the homophobic dean and homophobic principal made when they punished the girls for falling in love.