At 13 seconds in the entire place reverberates with a low boo, you're just mistaking that for the normal crowd audience because that's what ten thousand boos sound like.
It sounds a bit like background in the video, but its definably booing. And all the reporters there confirm it was unanimous, there was no significant sound of cheering.
This is kind of dissapointing (everyone I've talked to here for the past couple of days was expecting far worse) but there was definitely some booing going on-- the Philly Inquirer said she said she expected to be booed & they absolutely blasted the music in order to drown it out. Hell, Samuel Alito got heartily booed at a Phillies game I went to a couple years back, and who the hell even knows who he is? We boo everybody here. We even boo ourselves. BOOOOOOOOOOOOOOOO WHY THE FUCK DID I WASTE MY TIME WRITING ALL THIS SHIT WHEN I COULD BE WATCHING THAT CAT THAT FLUSHES THE TOILET.