thanks for the updated link.
those early boards had no metal edges and no sidecut - none of the boarders in that video could turn, so I can see why the skiers didn't want them there.
The rest of the dialogue was BS. I seriously doubt that most every kid they stopped was cussing at them and/or drunk. I know for sure skiing was NOT becoming "more an more popular". Snowboarding saved the increasingly expensive snow sport industry which was declining to the point where some resorts were near having to close....and some did close.