"It was a hatred of people that need to stand out for standing-out's sake. That realization was at once positive and negative—people didn't hate me because I was a hipster, they hated me because I looked like I was nakedly desperate for attention, and had gone about that attention-grabbing by glomming on to marginalized trends"

But that is (one) definition of hipster.

Casual speculation: Would the situation have been different if the sign advertising the service weren't hidden? I think yes.

Would the situation have been different if he weren't wearing stereotypical "hipster attire", and instead were in say a pinstripe suit? I think yes.