That's easy. If a Trumpkin starts spewing "Trump sh*t" with which one disagrees or that one finds insipid, ignore them. One can either sit and say nothing or one can sit and say nothing for a moment and then excuse oneself, either simply or by standing and to the person making the insipid remarks saying something akin to, "Would you pardon me for a moment while I go watch the leaves turn color," and then leaving the room.
(I strongly suggest not using the latter tactic with one's host or a host's peers. One may well find that the reply is, "Yes, of course. Let me bring your coat and have your car brought around so you can do it outdoors without getting too much a chill.")
While in social media venues, only certain people feel the impact of being ignored, in an in-person setting, the power of utter silence cannot be beat. No voices rise. No violence ensues. Yet everyone knows "what's what."