It probably helps that the reputation of both sets of supporters goes before them
When Scotland are in town it's party time. When England arrive the disaffected youth of the locale can misbehave knowing who will get the blame. The agenda had already been set in Boston before the first English fans got there, and finding the main Irish bar closed and gloating doesn't help. In fact, given Boston's traditional links with the more politicised sections of the Irish diaspora, it was daft having them there at all.
Seems odd that they take no issue with the Scots, whose descendents now occupy 6 of the 9 counties of Ulster, if they're leaning into grievances. Not that I think the animus towards England is well thought out or for that matter widespread with Bostonians (who will be overwhelmingly English in ancestry). My mates had a blast in the bars with locals all decked out in England shirts just enjoying the ale and a good time.
