Just because it wasn't something new for Nagi doesn't make it right or okay. Maybe he's hoping to reassure Omi that he's used to it and it's no big deal. To Omi, that isn't an idea that makes him feel better. He shouldn't have had to deal with it enough to be used to it.
"...not lately." There might be a tone of gratitude there, because he does think that the kids in most part have left him alone because of his association with Naru, Omi, and Ken.
"Why, are you gonna beat them up for me?" he says with mild amusement.
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"...Does anyone else here talk to you like that?"
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"Why, are you gonna beat them up for me?" he says with mild amusement.
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The underlying message, of course, being No, but I might make sure they're sorry all the same.