Not so sure about that, /r/The_Donald is by far the biggest subreddit. Trump voters are definitely capable of using personal computer.
I think they are boycotting twitter, because honestly, it is shit social network. I don't have an account there, for example.
People who created reddit are liberal cucks, each one of them, but thankfully they made it in such a way where you're dictator of your own subreddit. Twitter has more traditional moderation, which is why you see tweets being deleted all the time. On reddit, just make sure you don't give mod powers to liberals and you're good to go.
Edit: If you're person working in tech/hardware/software industry and you waste time following or writing tweets, you're doing it wrong. Evan Williams, man behind twitter has created Medium which is perfect for tech guys to waste their free time on reading and commenting on cool articles instead of fighting stupid wars about politics, social inequality and the likes. Every time I see "big" tech name on twitter writing stupid shit, I want to puke.