I don't understand .. why some people say kirito looks stupid
You don't understand the meaning of Netorare.
In real life, you may not know that your girlfriend is cheating on you without you knowing.
I think the meaning of this game NTR media as well
That's because most people think NTR is the same as cuckold , which is not always the case.They do have similarities , but since it's the only english word close to ntr, people tend to think they're alike.
Netorare is focused largely on the fixation of loss, the pain of having someone you love (even if it is not reciprocated or codified) taken away. So as long as this requirement is fulfilled , regardless of the pov , main protag , and story , the game is considered as ntr.
Anyway, the problem here is , some people are not really informed about the genre in general, leading to a lot of scrutiny and unnecessary discussions.
Edit: Forgot to say that, even with those points i've mentioned above, most ntr consumers are not masochist/doesnt self insert. Again, it's mostly rooted in the idea that cuckold (in western terms, it's mostly a masochistic pov) is the same as ntr hence the weird veiwpoint of people that doesnt really go for ntr.