We don't do Christmas, but had friends over for solstice pizzas. My wife announced a 'no politics' rule at the outset - not because of likely arguments, but just because it can get very repetitive and depressing.

It was a cosy and enjoyable evening after that - as they usually are.

Back a long way when I was living with my family we didn't talk about politics anyway: partly since it was widely understood that one didn't, but mostly since none of them were consciously political anyway. Christmas meals were generally free of arguments in general. The only point of contention was the mysterious presents that appeared for the children that actually came from dad's side of the family - with whom he had long-since fallen out and dropped all contact - and that consequently had to be disguised or kept under the radar one way or another. That didn't always work.