I don't think it is served by trolling peoples internet history to discover if they ever committed any thought crime. Our country will be better off the more MAGAers either age into the grave or get off the stupid train. Keep in mind that many of them are already decent citizens in the way they comport themselves in their lives, in the way they treat the people they interact with. They have just bought into a moronic ideology and will vote to enable further stupidity that will hurt their fellows in a way they would never due if given that straight choice between good and evil directly.
Isolating that person instead of communicating with them is a missed opportunity that serves only to signal our virtue to our fellows. It is a choice to enhance our social status instead of our society. It's positively trumpian and it plays right into his hands by making that person more isolated and thus more vulnerable.
Doing the right thing is hard. Do it anyway.
That's tone policing and a CoC violation. Marginalized groups have the right to be incivil.
Your ideology is constructed in order to grant 'incivility' (the moral permission to commit violence) to people based on whatever parameters are useful at the moment.
It's a horrendously incoherent worldview, and will shake itself to pieces.