Mo Nian is...fine. Mostly. A little brash, a little arrogant, but it's not as though the same couldn't be said for Xue Meng. If he seems to have rougher edges, to be less careful of the feelings and well-being of those around him, well--it's not as though there's been enough time to judge for certain.
He's currently bragging to some other boys his age in the front courtyard of his mother's establishment, which is...harmless enough. Probably.