@angell84 - And my point is very relevant - any English people in Ireland, receive huge levels of hatred.
I'm not denying your experience but claiming any English people in Ireland receive huge levels of hatred is just wrong. I'm in my mid 50's so grew up in the 70's/80's. I had a couple of English friends, both of whom were very popular in school. As they got older, there was the occasional comment, mainly from people who didn't know them but generally, being English was not an issue for them. I have English friends today who very much enjoy living in Ireland, just as I have Irish friends who very much enjoy living in England.
My parents lived in England in the 60's. They experienced an awful lot of anti-Irish sentiment, including being denied accommodation because they were Irish. However, if they're talking about their time in England they generally focus on the nice people they met and became friends with.
I spent time in England in both the 80's and the 90's. I experienced plenty of anti-Irish sentiment and comments. But I also met, and became friends with, some lovely English people.
There are nasty people everywhere who will pick on a difference as a focus for bullying. I think your claims that all English people receive hatred in Ireland is part of the problem you are describing. Despite being half-Irish, you are being xenophobic towards the Irish. Given your experience, that is probably to be expected.
Wrt your claim that we blame current English people for the sins of the past, again, I don't think that is the case. However, if an English person is supporting what was done by the UK or by British people (and there's plenty of it in the very recent past), then yes, it is acceptable to lay some blame at their feet. Nobody is blaming current English people for the plantations or the famine. However, an English person who thinks soldiers should not be prosecuted for bloody Sunday or other murders? They yes, they take a portion of the blame.