I don't think some of those guys understand that the tone they take actually turns people off from Trump himself. Or maybe they just don't care if he wins or not because it is more about validating their emotions than about winning actual elections.
Sarah Palin's supporters did the same thing to me a decade ago.
They were so certain that she was going to run and earn the nomination in 2012 that they'd attack anyone who posted interest in any other candidate except her.
It got to the point where I couldn't stand Sarah Palin before I took a breath and realized, "It's not Palin. It's her fan club that drives me crazy!"
And in the end Palin never ran and we were saddled with loser Romney. All that hostility for nothing.