"And of course indigenous peoples have had such a wonderful time when it's been, say, Irish, Scottish, Jewish"

You are quite right the word Anglo is much abused. I always find it strange to think that Anglo-Saxon England was conquered by the French speaking Normans and the occupation was pretty brutal for instance the "Harrowing Of The North" which edged towards genocide in that area. England became part of a wider Norman empire. Then when the still mianly French speaking Norman rulers of England turned their attention towards Ireland history potrays it as an English invasion of Ireland. Damned Anglo-Saxons! They kind of unfairly get a bad name. And that is coming from a Scot :-)

I'm never sure what people mean by 'Anglo' in the modern sense. Are they meaning English; are they meaning British; are they meaning English speaking; are they meaning white English speaking; are they meaning white protestant English speaking? I know english commentators will talk about Anglo (ie as in Anglo-American relationship) when what they mean is British-Ameican relationship! I don't think Scots etc use it particularly in that way!