Confusion about 1% etiquette

Hey guys, so I don't have a motorcycle myself and don't know much about that world but I saw this video pop up on instagram and saw some of the comments under the video mentioning "1% etiquette" and stuff like that. I'm just really confused about what actually happened in this video to make the biker mad? Seems like the woman who posted the video is just casually riding and then for some reason the other biker starts talking shit. I'm just so confused here and none of the comments on insta seem to explain exactly what happened. Just wondering if this is something that happens a lot and is a normal thing in motorcycle culture? Call me naive but I am not aware of this idea of "1% etiquette" so I'm left wondering what does this actually entail? To be fair, basically all the comments were ripping this guy apart and were taking the side of the chick. Just seems really ridiculous and silly to make up a bunch of dumb rules when you're a part of a club that is supposedly all about being a "rebel" and "breaking the rules" lol also seems really dumb to expect the general population to know and follow these rules. The vast majority of people don't care if someone is a part of some club. Acting like that should guarantee you respect just seems like a huge sense of entitlement to me. That's not even mentioning how dumb it makes a supposed "tough guy" look by threatening violence against a woman lol.

I've thought about buying a bike before but when I see stuff like this it really makes me wanna stay well away from motorcycles. Apart from the inherent dangers of riding, now I have to worry about breaking some unknown rule and getting killed by some maniac on an ego trip? Just looking for someone to explain all this and also curious what the general motorcycle community thinks of this stuff.