You seem to be having trouble understanding this comic. Thanksgiving is being hosted by his relatives, who don't want him there. Millions of Democrats host thanksgiving dinners every year. This would be one of those situations where he's being told to fuck off over political differences (though it's really more about he's built his personality around those differences and desires to harm other family members with them)

Being so obnoxious and harmful that your family doesn't want to be around you is not a commitment to family ties, it's a commitment to your own ego.