This is Ba Sing Se levels of delusion for some people.
A reference I never expected to see on HN.
It's insane, but then you realize that a significant portion of the US population _still_ only watches television news media and refuses to spend extra time looking at other sources, like Twitter.
Some people just don’t spend their time watching TV.
Edit: I know downvote edits are frowned up but... I need to ask: why are people downvoting this? Do you not think NCIS is good example of a mainstream show?
Also, HN is a global community, and even though many television shows are watched internationally, their impact on pop culture overall can be drastically different. So, you can't assume a major show in your country will be readily recognized by your fellow nerds in another country.
Let me remind you that the whole discussion started by me highlighting the popularity of The Last Airbender (due to Netflix, as someone pointed out) by comparing it to a mainstream show. I could have taken any popular show but thought taking the one topping the charts would be enough to illustrate it. Apparently not, and in the future I must carefully review the viewing habits of the whole HN community in order to make a point and not offend anyone.
So let me revise the comment: The Last Airbender is as mainstream as any other popular show today.