Hey, that's what the narrator said, what the story stablished. In any moment it says all irish people are like these, it just tells those incidents involved people that happened to be of irish background and thus that fuelled TTL americans prejudices. AFAIK, it could even not have happened actually in that way ITTL and those parts of the narration could have been told through an RU bias. Even if there was a real life anti-irish hatred here, then the author would be to blame, not a random reader who just answered a lore question because he happened to remeber two pieces of irrelevant lore trivia no one probably shouldn't actually care about.