I find the European heritage many Americans identify with thing nice, it's about your family history after all, many of those left not because they didn't love Scotland, England, Ireland, Italy but because conditions were so hard. If they've kept part of their traditions alive that's something to admire.
Yes it doesn't mean they have a lot in common with modern day people from that country but I see nothing to laugh at in it.
My daughter has an American passport despite only living there 8 weeks as a baby though!