No. This is about electing a President. Show your support in pre-election polls, rally/post/protest for your candidate beforehand, but the second you are faced with a choice between the two candidates who CAN win and those that have no chance, you need to treat your decision as it actually is- Candidate 1 or Candidate 2. It's not the time to play make believe and pretend like your choices at that point are anything other than what they are. Your principles are not more important than the lived experiences of other people. This holds true for Johnson supporters and for Stein supporters.
In my lifetime, twice now a bunch of overly privileged progressives have handed the Country over to everything they hate just so they could "make a point". If you believe in your principles, then you do what it takes to make them happen. To be blunt, you're hurting third party candidates if you do otherwise. It'll be a long time before the Green party can show its face again- just like last time it helped get a Republican into office without winning the popular vote.
And we all saw how that ended.