Those were the first who felt they were so good they did not need to listen to others.
It is wrong to label them as feeling superior to others. They are modest if not humble people.
Centuries ago, the religious convictions of these Anabaptists led to tragic reprisals. Their beliefs: complete separation of church and state, pacifism, baptism only administered voluntarily to believers not infants, etc. The Catholic and Protestant states considered these beliefs as threats and persecuted Anabaptists. Many were tortured and executed.
To escape persecution, many came to Pennsylvania in America starting in the 17th C. The Quakers were a similar group. The Mennonites and Amish emigrated from today's Germany, not the Netherlands. So they are Deutsche not Dutch. The English settlers bastardized the term
Deutsche into
Dutch.
In the latter 18th C a large number of Mennonites moved to the Ukraine, specifically the Crimean Khanate. They prospered until the Russian Revolution when their farms were expropriated. During and after WWII, they were relocated and persecuted by the Soviets. Many have emigrated to Germany.
I lived for years near the Amish and Mennonite communities. I have met a few on different occasions, e. g., a neighbor hired some Mennonites to cut some trees on his horse farm and later had a picnic. The Mennonites were good at playing horseshoes.