Sadly I think Jackson's video makes little difference to how things are handled on a local level. If you refuse to engage then you may get left alone but I suspect the minimum will be a local needs talk that will effectively rubber stamp shunning you. If you engage then any admission of celebrating Xmas will give them the licence to use the "disassociated by one's actions" card or even force you into DAing yourselves. You could easily be DFed as well if you get into a protracted argument.
You may have the right to fade but this only works if you shut up and don't get caught breaking the rules down the line. Faders out for years and well off the radar have more freedom but 6 months is not enough especially when you have "friends" ready to dob you in.
BTW, has your "friend" seen your tree? If not you could push back on "two witnesses" and ask why she did not speak to you first etc. But in my experience these tactics have limited value and you just end up DA/DFed.
Sorry not to be more positive...