Let's not pretend the Clinton camp is any different.
Both candidates have highly vociferous supporters and the entire process has been tribal as hell.
It is tribal no doubt, but most primaries are that way. Although from what I have seen online, Trump, Cruz, and Sanders supporters are the most vocal and enthusiastic. Perhaps not surprising since those candidates get more of the far right/ left and anti establishment supporters. Typically those on the fringes are more vocal than those in the center.
I honestly don't see many vocal Jeb supporters online. Lol.
In most elections, the base eventually gets behind the winner. I don't think Hillary would have a problem getting Bernie supporters, but the race has been fairly cordial so far. It seems both Hillary and Bernie are attacking a bit more.
The Republican side is more unclear. Eventually the base got behind McCain and Romney although reluctantly. This time Trump and his supporters have been attacked quite a bit by the establishment Republicans that I'm unsure if they would eventually unite behind a Jeb or Rubio. Besides they may have the numbers this time to push their candidate to the finish line. Although I could see the Republicans trying to beat Trump at a brokered convention.
If Sanders starts showing better polling results in southern states, then I will start thinking he has a chance to beat Hillary.