Yeah but as someone from southern new england I can assure you the irish immigrants still aren't accepted there totally either. Day to day interactions no one targets you for being Irish descent but structurally being Irish American is considered to be barely white, more like poor white which is barely white among elite circles (ughh Boston is full of the descendents of the original immigrant european religious fanatics and it shows sometimes).
Doesn't make any of this right but notice the way oppression must metabolize and neutralize solidarity in a fractal process of targetting vulnerable groups along whatever axis they are exploitable along. Irish Americans must be both the oppressed and the oppressor for the system to work, and it is the same thing just more dogpiled the further you go down the ladder of real privilege.
There was no damn potato famine, there was just England prototyping modern colonialism and capitalism on Ireland.