When speaking to your conspiracy-theory loving, Trump-supporting friends, it may help to keep the following in mind. It is a podcast / article about what motivates people to believe in conspiracy theories.
By keeping in mind the reasons that people cling to conspiracy theories, you may be able to frame your response to be something different than “But, that’s stupid, here’s a pile of evidence from… everyone… that refutes what you are saying,”. Saying such things isn’t compelling to such people.
I highly recommend listening to the very long running podcast series, The Savvy Psychologist. It is very pleasant to listen to and they get right to the evidence-backed point. I listen on Stitcher.