I think Thanksgiving is becoming an occasion mainly for conservatives. Being grateful for our blessings is normal for conservatives (See here and here and here and here) whereas Leftists focus on problems. And extreme Leftists of course say that the occasion celebrates a takeover of the territory of others by invaders and is therefore nothing to be celebrated.
"For years, the major Thanksgiving stressors have been set: politics and religion. But as a growing number of Americans go vegan, vegetarian, organic, local, grass-fed, free-range, wheat-free, or Paleo, a third flash point has been added — the divide between those who favor comfortable Thanksgiving fare and, well, food snobs."
And they go on to give examples of the real tensions that can cause. So once again conservatives are blessed. They may often have their own food beliefs but their appreciation of tradition would usually come to the fore -- so they would be very unlikely to make an issue of food disciplines on such a happy day.