One of the things I despise most about modern politics, which is by no means exclusive to the Sanders campaign but is certainly very prominent within it, is the hatred of complexity. You must be able to explain your position on all issues in one sentence. Any acknowledgement that major issues tend to be complicated and have complicated solutions, and that with any policy all effects must be weighed and considered, is often treated as "having no principles" or "refusing to answer."
Make no mistake, I hate it when politicians waffle or evade to avoid having to answer a question as much as anyone else. But trying to evade a question and trying to provide a reasoned, nuanced response are not the same thing.
This particularly came to mind because of the posts about fracking. I'm reminded of earlier in the campaign where I saw some Sanders supporters sharing a picture which had Hillary and Sanders' views on fracking. The Sanders column just said "no", the Hillary one was a block of text. The implication that having a stance that takes more than one word to explain is wrong is a perfect demonstration of this hatred of complexity and nuance.
Another case which springs to mind is minimum wage, where apparently even suggesting that one uniform minimum wage for the entire country is not the best solution means you're not a true liberal. Frankly, that sort of argument disgusts me. It's a very Tea Partyish attitude of "I don't care what's right, I just want something simple and easy which appeals to my views without actually considering what is best."