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The problem with that article is that for many regular cyclists, specialist clothing is normal clothing. I never go out on my bike wearing jeans (for example) unless it's a race to get to the post box before the collection time.
I just wear what's comfortable and practical for me. You could argu that cycling possibly has many more clothing styles that any other activity. Motor racing aside, driving had almost no specialist clothing (gloves aside), and the same goes for (urban) walking unless you're dressed for an event you're going to.
Knocking cycling-specific glasses is getting a bit silly. I always wear a helmet when cycling so I'm not about to stop just because it's a low-speed event - it might even be easier to have a tumble when lots of people are tottering along at < 5mph! Most of my cycling jackets are hi-viz because when the weather gets foul, it's hardly surprising that I also want to be more visible..
But back to my point, the majority of keen cyclists wear some form of cycling-specific clothing, whether that's lycra, mtb gear, "courier-chic", caps and woolly jumpers or whatever, so I think any photograph of cyclists en masse or illustrating an article is likely to create or embrace one stereotype or another.
That article even suggests changing into "ordinary clothes" once you get to a protest etc. Apart from finding somewhere to change, you then accept a stereotype that the cyclist will have panniers or a backpack. Can't win! :-D