I think that's human culture, not tech culture. Skaters and musicians and preppies and punks and goths and snowboarders and devout religious groups all have their own norms and behavioral and clothing signaling and most of it is not written down.

If I showed up to a half-pipe in full wedding garb or to a wedding in skater garb, people would reasonably give me weird looks.

Being able to appropriately adapt to different situations is a needed life skill. “In matters of principle, stand like a rock; in matters of taste, swim with the current.” —Thomas Jefferson

The benefit I see in tech is you can wear whatever “weird” clothes you want and be accepted and given a chance to prove you can do the job much more than in most workplaces. Try showing up to a law firm or investment bank in flip flops and shorts vs showing up in a suit in tech. You’ll get a lot farther in the latter than the former. To me, that's fair (or at least wildly more fair.)