I think you have a good point and I wouldn't say that I am certain I am correct here. I am, perhaps, optimistic about changing the public image that knives are just for old men, rednecks, and mall ninjas.
Keep in mind that the parts of the country where hipsters are most accepted (New York, liberal west coast, New England) are also the places where knives are the most looked down upon... Sure, folks in rural Alabama are gonna look at a hipster like a pariah, but I don't think that's the demographic that needs the most convincing that knives are a useful tool. On the other hand, when folks in Manhattan see relatively acceptable Hipster on his single speed bike with messenger bag whip out a pocket knife, it normalizes it for them, since Hipsters are already a normal part of that culture.
Again, it could just be that I'm being optimistic here. You definitely make a good point that hipsters don't make our strongest ambassadors!!! Of course Ted Nugget is a flaming ass-hole and I don't think he's hurt the pro-2A movement too badly despite his best efforts....