Definitely what we need is more categories and sub categories, cliques, niches, sects, tribes, and subcultures. The world is far too harmonious as it is.
I bought my fixed because I wanted to try it. I was not even aware it was a trendy thing to do. I'm a Morris dancer who listens to early rockabilly: I don't do trendy.
I ride my fixed because I enjoy it. I have sometimes had it set up with a freewheel, sometimes with a flip flop hub. I ride it on and off road, occasionally commute, and I sometimes go for weeks without riding it. I also own a 2 x 10 gravel bike (although it wasn't called a gravel bike when I bought it because I liked its features) and I have a garage full of unicycles (24 inch general, 24 inch muni, 700c road, 29" muni, and 36" general) and enjoy riding them each for slightly different reasons.
We could just enjoy riding what we ride, and sharing stories and hints and tips.
Do we want to become like some obscure branch of punk or metal, with half a dozen adjectives: hardcore Scandinavian dark death speed thrash cyclists, or something?
The only true bike culture is enjoying riding bikes and respecting others who ride theirs. The rest is passing fashion and fad. Single speeds and fixed riders have much in common, and some differences. Neither is right nor elite.