i did the field service every year i was in the dreaded witness, hated it, i thought it was wrong as did many others at the time. i remember some years after i'd left, i was happily celebrating christmas with the little woman and the kids, when the js knocked. i encouraged the wife to answer the door. she said "no thank you i'm a bit busy right now" then popped her head back out and said "merry christmas".
i said "why did you wish them a merry christmas, they dont celebrate it"
"oh! i forgot"
it made me smile how uncomfortable she must have made the jw feel, but hey only the js would come round and not expect people to wish them a merry christmas on christmas day.