Not sure which demonstrated the greater stupidity... speeding, splitting lanes at speed, not wearing proper gear ... or recording those actions and then posting them publicly.
Yes, that is why motorcyclists get a bad name and also why the statistics show motorcycling is less safe than most other forms of transportation
The 2nd video is more what I would consider reasonable as well... Cars aren't going anywhere anyway, so not much chance of anyone 'suddenly' changing lanes.