Is hold door for Amish offensive? in Just Life

Excuse my ignorance.. I open a door to show respect. I opened the door for a group of Amish people. A woman said she was capable of doing it herself. I held the door for the entire group. I told them I hope they have a nice day and safe travels. The woman appeared irritated but I was opening the door to simply be respectful. Did I do something wrong by being kind?