The kind of extremist religious zeal exhibited in this video is the worst aspect of the Linux community.
Thats why the group that makes the OS on most grocer's POS systems employs him, he is basically #QuitYourBullshit IRL, with some humor on top.
That being said, it is far from the worst part of the community, that is by far reserved for the bullshit that some community members have pulled on those of us that are female. I've seen talking down to active Ubuntu Local Community heads at conferences and local happenings put on by said Ubuntu LoCos and it is HORRIBLE. Why the fuck do certain people feel the need to repeatedly harass a volunteer?