Im pretty good with sitchuations like these. I grew up descalating shit like this to survive. The easiest way to stop a fight is get someone caught up talking about mundane shit.
if they ask "did you vote for trump
i respond "i cant even vote, im felon"(regardless if its true or false)
*They then try and implicate you supporting trump
"I cant vote, i dont give a shit about who wins but hey man do you how much it cost to get packaged mailed to Arkansas?"
and then there just keep trying to get them to help you figure out the cost of mailing the package and when you leave just say "thanks man, i really appreciate it" as a genuinly as possible.
or ask them what time a popular TV show comes on or play the pitty card and talk about how bad a relatives health is and you couldnt be bothered with politics because you got some heavy shit to deal with.
just talk about stupid factual shit like movies, TV, cost of something, how to get somewhere, or ask about how much their insurance cost and act like your agent is fucking you.
The entire you talk about what ever mundane subject you choose you should be thinking about an exit plan if it goes bad.