I grew up and live in the part of PA that is home to the oldest Amish community in the US. Having both Amish and Mennonite neighbors they are part of everyday life. I come partly from Anabaptist stock. The Anabaptists (Amish, Mennonite, Brethren, etc.) do not practice infant baptism, believing that the choice to be baptised and enter into the congregation is one to made when a person reaches adulthood. I suggest you be wary of painting an entire group of people with broad brushstrokes. There are Mennonite churches that support LGBTQ people and welcome them into their congregations. Their members live and raise their families much like anyone else. There are also the Plain congregations that still live much stricter lives and still practice Rumspringa. Rumspringa is the practice, typically with the Amish, of allowing young men and women the freedom to see what life outside the Community has to offer. After a time, typically a year they are asked whether they wish to remain within the community and join a congregation or enter the world at large. Most remain. Like all groups of people there are good and bad aspects. Just like with the "English," Plain Amish and Mennonite people deal with child sexual abuse, spousal abuse, alcoholism, etc. They are human beings with human faults and admit being Amish or Mennonite does not make them perfect. Yes, there are elders/bishops who still hold very similiar views to the elder in this story. Just as every faith, Christian or otherwise including non-believers have self-righteous members. As a child I was taught to be careful about pointing a critical finger at others because when you do some of your fingers point back at you.
By-the-by I am enjoying this story.