OK, that video absolutely belongs in the dictionary next to the word/phrase "attention whores". Seriously, go practice your "sport" in the most public places possible, and literally scream WATCH ME!!! WATCH ME!!! They succeeded in getting two people to clap, which absolutely made it into the video. In my opinion, that video featured a bunch of douchebags.
Also, it is worth noting that the "slackline" featured in the video was not a slackline at all, but a "cheat line". It was extremely wide, much much more so than a normal slacking. It also did not even appear to be webbing! The video was absolutely not a representation of what slacklining is, or what it is about. I guess this falls into the "hate" category, but it is the truth. I have no problem with slacklining, especially if it is not for the sole purpose of being an attention whore.