I have been on reddit for just about 12 years now. Something I've noticed over time is just how hateful the place has become. A complete outrage machine. Every single sub became filled with it. I've filtered so many subreddits over the last few years, it's insane. I don't know enough about this place to be sure, but I do hope it doesn't become the same type of echo chamber of anger.
My dress communicates specific political and ideological beliefs. If I choose to open carry, that communicates specific beliefs. If I choose to wear a BLM T-shirt, that communicates beliefs.
It sounds like you’re perfectly happy to judge people by what they wear, so OP’s example is clearly apt.