Unfortunately the Irish still have a victim culture carried over from Colonial times which makes it difficult for them to take responsibility for their own national character flaws and mistakes. The English are fairly straightforward people who tend to take you as you come without prejudging you. The Irish and the Welsh at least will prejudge you - place you in a little labelled box and never change their opinion of you from that day forward. Tradition is fairly much ignored in England but tends to be the defining quality of the Celtic fringes.
Just my observations from having lived as an English/Irish man in both England and Ireland.
Yet, you stereotyped Irish people and Welsh people. You should have thrown in the Highlanders too. Seriously, I thought that you were psychic after I read your post. You mentioned something that I thought about today. I wondered if "Celts" tended to be more conservative and traditional than "Saxons". I guessed that they did. I somewhat based my guess on Americans with roots in Celtic countries/regions. I always doubted that PC nonsense would be tolerated in County Cork. It never went over big in South Boston or the Appalachians. I found your post to be fascinating for a couple reasons, and I also wondered about something else. Could you determine folks origins based on their physical characteristics?