There is a time and a place for questioning and challenging. It is most certainly not on the floor of the party convention, in front of a national audience, when the party (for whom you are a delegate) is trying to put on its best face in hopes of kicking off a strong fall election season.
The level of sheer ignorance as to what this whole thing is about, and why they are there, that I've heard expressed by some of the Bernie Bros today, (and I've had MSNBC on, so presumably they're not going out of their way to locate the most absolutely clueless people they can find...) is staggering to the point of hilarity...
One young woman was
indignant at the fact that "all the speakers last night were for Hillary"...
A guy who identified himself as one of the Opening Prayer booers, when asked if he didn't think that was "rude", replied: "I think it was rude that Hillary Clinton was mentioned in the prayer"...
I get the distinct impression that some of these people are
so clueless about what's going on here, that they believe that Bern might
still get the nomination...

("Why were all the speakers promoting Hillary? Shouldn't some of them have been attacking her and speaking for Bernie?")
Earth To Bernie Bros:
National Conventions, 101:
1.Your candidate
lost. ( He knows it, that's why he's endorsing Clinton, and trying to get you to STFU)
2.Hillary Clinton has a majority of the delegate votes. That was determined through the nominating process. That makes her the nominee. That also make this "her" convention...
3.There's
no such thing at a national convention as equal air time between speakers who want to support the nominee, and those who want to oppose her, and argue in favor of the person who lost....
Sorry, it just doesn't work that way...
4.The
whole purpose of a major party national convention, when the nominee has the delegates for the nomination prior to the beginning of the convention (which has been almost all of them in modern times) is to provide an opportunity for that party to present basically an "infomercial" showcasing what it has to offer, and presenting a display of unity for the electorate going into the general election to make its case against the opposition...
Apparently a lot of the Bernie Bros never got the syllabus ...