Stage set today with a lot of major cities announcing new bullshit... I'm kind of hoping he challenges people to dis-invite family for Christmas over it.
There's plenty of idiots that will bite to be sure, but anyone with a shred of decency will have to wake up after that.
The ones that do disown family over vax status will have made their choice and can live with that, but for everyone else it would be a Christmas miracle to see who actually passes or fails that test.
Your idea has merit, OP, I can see them trying to use the opportunity to divide people further. Would give a clear picture of who is still under the spell.
On the other hand, I can see Xiden doing something completely nonsensical and demented (not to mention unenforceable) like declaring that pure bloods are forbidden to celebrate the holidays in any way, shape or form and encouraging neighbors to rat on one another. Either way, we shall soon see.