As others have said - completely self-indulgent, all-you-need-is-me, reactionary tripe.
Yet, that said, objectively, I also saw through his eyes. Once there was a time, probably more with other hobbies than mountain biking, truth be told, that I also probably had similar perspective in my youth / young adulthood - were I had no real commitments, as much free time as I really needed, and a perspective of JFDI. So something of a dichotomy for me - some head nodding, yet some of that in the knowledge, that I was really agreeing with utter twaddle - but there's the rub, you see - probably at times most had similar, stupid, arrogance and dismissiveness to our perspective on things. Most grow out of that phase, though...
All the same, though, and it's hard not to see the wires, and the desire to make a point, to brandish ego, to be controversial, to write an article as if all that matters are his values. But then I suspect that was largely by design, largely done for effect, largely to make HIS point - whether it was exaggerated for effect or otherwise.
Whether it was feckless, arrogant, and / or ignorant - and whether on purpose, or simply belligerent - is probably a tad irrelevant. The reality is - for countless pastimes, hobbies or pursuits - that people are involved for a variety of reasons - and I see that as a positive, rather than a negative - and the only people standing out, loud and proud, by saying something brash, are doing so simply for attention.