Before the election, Scott Adams wrote a column on how to de-hypnotize a rabid anti-Trumper. I read that column over and over (and even made a little cheat-sheet summary for myself) because I was making calls for Trump and had to talk to a lot of rabid anti-Trumpers. The strategies didn't always work,but they often did get people to at least pause and think.
I'm going to re-read it because I'll be at an even and people there are always making random anti-Trump comments. He gave ways to respond to specific Trump criticisms. Those may not be relevant now but the strategies could be adapted to the current Trump attacks.
http://blog.dilbert.com/2016/06/19/how-to-un-hypnotize-a-rabid-anti-trumper/