Other Democrats are not opponents but rivals. I support Bernie but I sure as fuck don't see other Democrats as the final nail in the coffin of hyperbole. I look at a menu I say I prefer the chicken, I have no need to rail against the steak.
How does Bernie do politics? Not the way you are suggesting. Which is one of the things I like about Bernie, he has the skills to avoid the gutter and navigate the discussion to the heart of the matter.
But on the other hand, I strongly support Hillary's suggestions for automatic voter registration and extended early voting and I'm happy to hear those messages being delivered. It compliments Bernie's call for more and better debates, it's taking on the election itself from the first, as a Party.
As you know, the Oregon primary is a year away. Personally, I want attentive voters attracted by a vigorous race between excellent candidates. Oregon added many Democrats to the rolls in 2008 cycle primaries. I'd like to see that again.
Also, for what it's worth, 259,000 Oregonians voted for Hillary Clinton. This indicates that a large number of Democrats might not agree with your characterizations and some might take them personally, even ascribing them to Senator Sanders who does no such thing. That means it's stupid politics if the goal is to elect Sanders.
Then there are issues of message dynamics. Even if a person might eventually have to shout and call names, starting out at that level leaves a person with no way to return to the issues and no way to pipe down the intensity. A year of bellowing against your rival will make many people dislike a candidate. You can't start with the shouting too early. It's a freaking year.