I think that the Brits are in deep shit if the Irish ever invade.
I'm confused. Do you mean to joke around with the British?
This is no joke. British people love Ireland, but do Ireland love irish?
The British people and Irish people get along just fine. Sure some might not like each other but overall their relationship is friendly.
I don't think anything bad will happen to either. I just think it is interesting to thing about.
It is okay to be curious about how other countries get along but you should be careful about generalizing the people of those countries. Not all people from the same country feel the same and I doubt all the British people feel exactly the same way about Irish people.