My Mom was still living near Lancaster PA last year and I spent a lot of time down there. Never once saw an Amish person wearing a mask, also didn't see anyone harassing them when they entered a business when the mask mandates were in effect. The Amish schools never closed.

The only concession I noticed the Amish made was suspending Sunday services for two weeks when lock downs first occurred. Amish people don't worship in a church, they meet at a different member's home each Sunday. After that it was business as usual.