Responses
I was thinking the opposite of you. Everything we learned could have been accomplished in two chapters and we could have gotten some acual development with the characters during the rest. This mostly felt like padding to me. As for the pink haired guy, yeah it fells like an overreaction to me too but i feel like most guys would react like this. Most men dont want to be stared at by other men. I think most would confront the guy and either tell him to stop or start a fight (if hes especially insecure/homophobic)
I rather enjoy that the manga is taking the time to develop the story and characters. Though I find the pink haired guy a bit oversensitive and over-reacting to what is after all at most minor weirdness. The worst the MC has done is stare at him a bit too much.
On a side note, I believe I once saw a program about facial blindness, in which those who suffered from quickly learned to identify people by other things. Such as timbre of voice, the way they moved, body type. Clothes and hair helped. None of it was foolproof of course, and they did often make mistakes. The same way we can recognize someone at a distance even when we can't see their face.