Not sure of your point about 'never having to sing Jingle Bells, Dick?
Is that a choice you've made permanently?- have you never been asked?- I found it very popular in community situations in Ireland, so not doing it must be a choice you make?
   How do you feel about the 'Wild Rover'?- and I don't mean some variation of the standard clap clap version- that's fine in a folk club, but in the real world, it can lead to disaster in audience participation!
   Bob Davenport gave me a lot of excellent advice, and one was ALWAYS TO DO REQUESTS (where possible anyway) even if it's the 'Wild Rover.
If you do that, you can do what the hell you like after that. I used to try & divert attention away from some ghastly Irish stuff like 'Grace' but I always tried and it's worked fine for me for many years.

I applaud your singing the 'trad' songs you mention in a community setting, but Scotland is no different in accepting the 'Road to Dundee' or the Barnyards o' Delgaty' & I'm sure Vic would say the same is true in Sussex?
Oh, and sorry about this, but I DID once sing 'Jingle Bells' in the Kirkcaldy Acoustic folk club, but that's another story & this is too long already....