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It wasn’t his intention to out Makoto anyway; it was a large lecture hall, and Shiro stands out so people were eavesdropping even though they normally wouldn’t. His ignorance in that moment makes him unlikeable, yes, but not a bad person.
Also to call what he did “manipulation” feels like an exaggeration, to me Makoto twisted his words only because he was scared. Nagizaka even brought Makoto to a secluded area and confronted him about it but in the end it was Makoto who gave himself away. He even tried to make amends after that. I mean, can’t say Nagizaka is the epitome of an angel or anything but I feel it’s a stretch to call him “a piece of shit” just from this.
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Pushing someone to come out is manipulation at it's finest. If you are straight, you wouldn’t know what it feels like to come out. He is a pos for doing what he did. It doesn't matter what his intentions were, outing is a big deal. If he ended up saying what he wanted, that would have been a disaster.
They acted like nagizaka was a bad guy but I feel like he didn’t do anything wrong but try to be a good friend?? Besides him ending up brutally alone loved the manga :p