I raced motorcycles professionally for many years. Riding like this on a public highway is just plain stupid. There are lots of riders that think it's "cool" or makes them look "special". Fact is they are just 100% wrong. I do not care how talented you are on a bike, the faster you go the less time you have to react. Like reacting to a driver moving in front of you because you came up on them so fast they didn't know you were there.
It would not be so bad that they are just risking their lives, but the are risking the lives of other drivers as well.