Computers.
Not even computer games, although that would have added bonus points as a target for bullying, but using a computer in general.

Then again, bullying was more of an attitude thing during my youth, so you didn't get bullied for you hobbies, but for your behavior.
Ugly geeky kids were left alone if they hung out with other geeky kids. They got bullied as soon as they tried to associate themselves with the cool kids.

That took me a while to think about.

Well the other kids thought those of us playing Dungeons and Dragons in the early 80s were nerds. Didn't help that we also made the best grades. We also didn't dress like the cool kids. It's hard to separate all of the factors that caused us to get bullied.

There used to be this hierarchy of nerdy stuff. The comic nerds looked down on the war gaming nerds who looked down on the tabletop nerds who looked down on the larpers. As a comic reading, war gaming, roleplaying, larper I always thought it was weird.

Food. At lunch having “exotic” food was weird and you got teased for not having a bland sandwich.

I don't think there was any actual bullying because of it (I'm not American, school was pretty nice and my memories are almost entirely positive, lol) and I don't think it's become any less nerdy but Magic the Gathering was certainly my nerdiest passion growing up. And yes, there was a hierarchy: the Beyblade kids were less nerdy than the Yu Gi Oh kids, who were less nerdy than the MtG kids. 😅👍

British comedy like Monty Python

Same thing but in western fandom, it was called Japanimation for a while. Speed Racer was from the 1960s or so, I think.