I will never ever excuse this kind of behaviour, it's despicable and horrible and needs to change. However, you do realise this happens to many other kids? Muslim, Jehovah's Witness, Sikh etc.
I mean of course I realise this. My daughter had actually made an enemy of this boy because she stuck up for her friend, a refugee from Hong Kong, who was being racially abused by this boy with anti-Chinese slurs. He has also been racist towards Indian, Pakistani and Black students and teachers.
However, I've never met a religion that's as insular as the ultra orthodox Jews.
I think there are plenty of very insular religious communities. The Plymouth Brethren, for example, and some Muslim communities (e.g. Somalis). I wouldn't like to compare how insular each of them is. I don't live in a community like tht myself.
I also find the excuse of previous persecution as a reason for insulation uncomfortable.
I don't like the phrasing of this sentence. It's not 'an excuse'. They choose to live this way. They don't need to 'excuse' it. It's not what I would choose for myself and I live very differently from that.
This reads a bit like you think I'm trying to say Jews are special or different or deserve 'more' than other ethnic groups. I don't. I do think, however, that we grew up very much in the shadow of the Holocaust. I don't know any Jews of my age or older who weren't personally affected in some way - I knew several survivors when I was young, and huge swathes of my extended family (parents/grandparents/great grandparents' generations) were murdered. It does leave a scar.