And what exactly are they doing to him? His problem is that the girls are not interested in him but someone else. Guess what, most guys don't really get any special attention from the girls, unless they work for it. Though the same is true for most girls vice versa. There are the few popular ones who are natural at it, like Rei-sama. This guy Tohno gets plenty of attention, yet annoyingly the girls aren't really interested in him but his brother. Does he do anything to change that? Not really. The one girl who is interested in him specifically needs to work ten times harder because Tohno keeps pushing her away. Most nameless guys or girls would be envious of all that attention from the opposite gender. Sure, they wouldn't know how annoying it can be when it's not really about them, but it's still a lot of interaction they don't have. What a luxurious trauma, really.
I don't know if I'm socially normal (probably not considering my post count), but you are Tohno's MD account. Don't worry, kid. This will only last until Rei-sama has graduated. And it could be a whole lot worse. All those people treating your fairly, albeit with hidden agendas, could instead be every day comparing you to your brother, telling you how you are nothing compared to him. Your brother could also behave arrogantly toward you, instead of being the nice (but lazy at home) guy he is.
