No, they are not similary distanced. I can be derisive towards General Motors without any inherent derision towards people who drive a GM. I could even belittle a specific model of car without any inherent disdain towards those who drive that model.Quite possibly. In which case, it would be just the same as "dumbing down". Or "videogamey". Or "rollplaying not roleplaying". Or....
"I'm not being rude to you, just saying rude things about what you like" does not seem that far removed from the above. And if you don't feel insulted by it, there's no reason you should be insulted by nerd rage either; they're both similarly distanced.
Of course, it's possible to couch such derision so that there's explicit or implicit derision towards GM owners. It's also possible that some people are so fond of the GM brand that they regard any derision towards the brand as a personal attack. Similar scenarios exist for brands of video game consoles, sports teams, alma maters--you name it. There's a middle ground where the speaker has some onus to be considerate of people who are passionate about the subject, and the listener likewise has some onus to separate his identity from a subject that actually has no inherent connection to him.
However, feelings and opinions are integral to a person, and there's not much middle ground therein. To belittle them is to belittle the person possessing them.