There is a difference between focusing on a certain part of the whole and speaking as though that certain part is entirely representative of the whole. It's less like talking only about China in a discussion about Asia, and more like using the words "China" and "Asia" interchangeably. Touhou and tabletop games may not be of interest to a general audience, but these things don't necessarily have to be discussed in depth; they can be covered as briefly as a sentence stating that "4chan hosts a variety of boards catering to various interests, including video games, Japanese culture, and cooking."
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There is a difference between focusing on a certain part of the whole and speaking as though that certain part is entirely representative of the whole. It's less like talking only about China in a discussion about Asia, and more like using the words "China" and "Asia" interchangeably. Touhou and tabletop games may not be of interest to a general audience, but these things don't necessarily have to be discussed in depth; they can be covered as briefly as a sentence stating that "4chan hosts a variety of boards catering to various interests, including video games, Japanese culture, and cooking."