I think all those things are in there and I took it as humour. The flaming came in the comments.
If you look at the graphic at the top of this thread it has a cartoon of a very large cyclist in Rapha Lycra
There is a bit of an implicit dig at a tendency to go into something right at the top so you buy an expensive bike, get all the kit etc before earning your spurs..??
The only sportive I have participated in is the etape and you were released in batches related to the time you estimated you would finish. Mostly clubs, groups of amigos etc all bombing along, none of the behaviour described in the blog. Except fair bit of undertaking on bad corners at high speed but some of those dudes then came off. Big signs held up on some bends SLOW DOWN etc.
Maybe in england shire you cannot get moving for sportive s blocking your routes? I doubt it but some of the dourest cyclists I have ever come across have been in rural Cheshire.
So I think sportive riders is a way if trying to group the behaviours that as has been stated are discourteous to other cyclists
brace yourself for big hike in mad cycling as another batch of students hits town. Remember they are students so they are only learning about all sorts of things (which side of the road you cycle on, what pavements are for, what a red light might mean etc). Keep smiling