Hmm, interesting.
It looks like this boy hates nobles. Is that because he was envious that we live better than him or is it because something happened to him or his family?
It doesn't matter. if he has any bad ideas about my family, I'll eliminate him.
Now let's first try to diffuse the situation. Killing a kid, just because he tried to enter through the noble's gate or making a few rude comments on a young master would be considered too much. Though the people won't speak against the nobles, there is deep-seated fear and anger against many of them.
They just kept their mouths shut because they were powerless. If one day, when the awakening rate increases, there will be more awakeners of common people when compared to that of nobles. It would be bad.