>>33576448 (OP)
Explain modern politics are a firehose of misery and you value you mental health enough to just not engage. Say you don't vote because you don't know, and whatever comes of the elections will come. Say you don't judge them, heck you are happy they are engaged, but you just can't spare the mental bandwith for it.
And when they don't shut up, ask them who they like in the next election, pause in contemplation, and say you are going to vote for whoever is running against them if they don't shut up.