I don't have much to add to this. The images speak for themselves.

First, this is what the crowd looked like immediately following Hillary's closing words

They're clapping, but you can barely tell looking at that picture. And they're sitting down, subdued. Some cheering, but not much. The response seemed to be Yeah, ok, I guess she's alright.

…

Then we have Bernie

The crowd is on its feet, and they're clapping and cheering wildly. They're fired up. They loved what they heard and they are doing whatever they can to show their enthusiasm for it. Watching the video you can see the people in the foreground were hesitant at first, but then they too got into the feeling and stood up.

This illustrates precisely the contrast between the two Democratic candidates' prospective effects on the American people in November.

We want to grow the party right?

Well for that purpose we don't want folks to be simply acquiescent to Democratic policies and politicians, cheering and clapping for them, but subdued and quietly, because cheering with wild abandon might upset someone.

We want to be standing up and cheering our heads off for our politicians, clapping until our hands hurt but who gives a damn when we're clapping for what we know is right and true.

Which is what folks do for Bernie.

Here's the vid