I also don't see what's wrong with people mentioning other fandoms here, or why they should be called out like this for doing so. Especially in this case where it's still extremely relevant and brief. I don't think it "clogs" a lounge thread that's specifically for friendly discussion. The intro says "anything goes" even "what you had for lunch" but people get scolded if they talk about Star Trek for a minute? Seems like an arbitrary request.
Also I have no problem with people identifying themselves if they want to.