Nah, I never really noticed any issues like that growing up in northern Lancaster County.  Most people just accept it as a way of life, and when I was young I thought there were Amish everywhere  not just primarily in Lancaster County.  I'm sure there are some youths that have yelled nasty things and I can recall a couple times where the newspaper's police log mentioned vandalism or verbal abuse; but by-and-large it's not at-all a common occurrence.  Oh, apart from when the Amish teenagers are playing with the electronics in the supermarket... I'll admit even I smirk at that, but people are usually respectful enough to keep their chuckling to themselves.  All of the Amish I know are understanding that they lead a very different way of life and simply ignore any insults thrown their way.  As they tell me, the major concern between them and the outside world consists of two things: rising costs of living and road safety.  To them, public image is irrelevant.