
Like super niche stuff. I play D&D, and I reenact. Out of those two, I consider reenacting to be nerdy (it’s niche, requires immense technical and historical knowledge, and is a huge investment). D&D is kinda too mainstream nowadays for me to call it ‘nerdy’ in earnest. Same applies to video games, MTG and the like. Cosplay is nerdy tho. 👍
I mean I have other interests and am capable of doing things that don’t fall into these categories but it is like the stuff I like most, a fair amount of my outfits are ripped jeans and tee shirts with something from one of my interests on it and if I’m going to have something like a useful item such as a water bottle I’d rather it be something to do with my interests like the one I use is transformers themed
I would argue it doesn’t matter how mainstream a thing is for it to be nerdy. Nerd culture is encompasses a lot of things, you can be into history or dnd or comics or science. Just because some things from nerd culture become more mainstream because of shifting pop culture and popular media doesn’t make it not nerdy