I think there's two different types of "tech", and it's cool to have stuff (apple gadgets, social media) but it's still uncool to be into computers. Apparently colleges are having problems because new students have no concept of how to use an actual computer, can't grasp how filesystems work, are used to apps just being a button on the home screen. Modern phones have obfuscated pretty much all back-end stuff save for a few switches on a settings screen.
For a while it wasn't, but since smartphones computers are not used by most kids anymore, to the point employers have trouble hiring people with even basic computer skills.
I was never bullied for it. In fact a lot of people thought I was some master hacker who could help them out. It was mostly novel or intriguing to the other kids I interacted with, until high school when I met other people who were interested in that stuff.
I gained some air of notoriety with "popular" kids in secondary school after getting in some publicised computer-related shenanigans.
I'd also imagine computery-type teenagers are often introverted, which doesn't help.