Rananim says
"...but 733 asked a question and deserves a straight answer."
So what do you actually mean by your answer?
Is is a) you would have a problem with an Irish person showing you how to fly a 737?
or b) anyone showing you how to fly the aircraft (I assume of course your knowledge of your new companies SOPs would be flawless from day 1)?
Or perhaps, and this would appear the most likely to me, that you are a little peeved that the most successful airline operating out of Britain is no longer flying the Union flag, but the Tricolour and an EI reg?